29 results about "Excited state" patented technology

The invention relates to the technical field of fluorescent probes, and provides a fluorescent probe luminescence brightness quantification method and system for coupling excitation wavelength detuning. The fluorescence probe luminescence brightness quantification method for coupling excitation wavelength detuning comprises the following steps: constructing an initial structure of a probe molecule, and optimizing a geometric structure of a ground state of the probe molecule to obtain a stable configuration of the ground state of the probe molecule; based on the stable configuration of the ground state of the probe molecule, the excitation states are calculated, and the excitation energy of the lowest n excitation states of the probe molecule and the absorption transition dipole moments of the probe molecule in the X, Y and Z directions are obtained; based on the stable configuration of the ground state of the probe molecule, optimizing the geometric structure of the lowest excited state of the probe molecule to obtain the emission energy of the lowest excited state of the probe molecule and the emission transition dipole moments of the probe molecule in the X, Y and Z directions; and calculating a luminance index in combination with the energy parameter and the transition dipole moment parameter so as to select an optimal probe. Therefore, accurate and rapid prediction of the luminescence brightness of the probe is realized.

This invention provides a highly efficient method for separating or concentrating lattice defect-containing nanoparticles (NDs). [Solution] A method for separating or concentrating lattice defect-containing ND particles, comprising irradiating a dispersion containing at least two types of ND particles selected from nanodiamond (ND) particles having at least one type of lattice defect and ND particles without the lattice defect with at least one type of excitation laser light having an energy greater than or equal to the resonance absorption energy of the lattice defect and at least one type of stimulated emission laser light, thereby selectively moving the ND particles having the lattice defect by the absorption optical pressure generated by the absorption of at least one type of excitation laser light and the stimulated recoil force generated by the action of at least one type of stimulated emission laser light, wherein the excitation laser light transitions electrons in the ground state of the ND particles to an excited state, and the stimulated emission laser light transitions electrons in the excited state to the ground state faster than spontaneous emission to generate stimulated recoil force.

The application discloses a quantum phase-locked detection method based on entanglement enhancement, encodes quantum bits in a ground state and an excited state, and prepares the quantum bits as initial quantum states; a periodic multi-pulse sequence is loaded on the quantum bits; a carrier wave pulse resonating with the ground state and the excited state is loaded; a final quantum state of the quantum bits is detected; curves of each component of a measured density matrix and a theoretical density matrix changing with a pulse time interval of the periodic multi-pulse sequence are compared; and a half period and an amplitude of a to-be-measured sinusoidal wave are obtained. The application can effectively suppress measurement noise under the condition of existing rotation angles and detuning errors, and can maintain high measurement precision under the condition of existing rotation angles and detuning errors. The robustness makes the application more reliable in practical application.

The invention discloses a quantum fidelity estimation method based on a resonance algorithm, and relates to the technical field of quantum computing, and the method comprises the steps: providing a target quantum system with the fidelity to be estimated and a detection quantum bit, initializing the detection quantum bit into a preset energy eigenstate, and enabling the target quantum system to be a quantum state prepared by an experiment; coupling the two to form a coupling system; controlling the coupling system to evolve for a preset time under a preset resonance Hamiltonian; measuring the probability that the detection quantum bit is in a preset excited state; frequency sweeping parameters in the resonance Hamiltonian are adjusted, evolution and measurement are repeated, when the frequency sweeping parameters are matched with the target energy level corresponding to the target quantum system, a peak value appears in the excited state probability, and the peak value is the fidelity of the target quantum system and the quantum state corresponding to the target energy level. According to the method, a large amount of multi-bit measurement is not needed, quantum fidelity estimation can be realized only through single-bit measurement, the measurement times are reduced, and the measurement realization difficulty is reduced.

This application discloses a rare-earth upconversion luminescent material, which comprises a multi-component complex; the multi-component complex comprises a rare-earth metal ion center and an organic ligand chelated and coordinated with the rare-earth metal ion center; the rare-earth metal ion center comprises at least two Yb atoms. 3+ Sensitizer; the upconversion luminescence excitation wavelength of the rare earth upconversion luminescent material is 980 nm; the multi-component complex contains less than or equal to 20408 cm⁻¹ ‑1 The energy levels of the excited state; the rare earth upconversion luminescence is the Yb 3+ Upon excitation, the sensitizer co-transfers energy to the excited state of the organic ligand, which then undergoes upconversion luminescence. This application represents the first realization of upconversion luminescence in rare-earth molecular cages, potentially enabling lanthanide organic components to become novel upconversion luminescent materials for biological applications.

Systems and methods are disclosed for determining interaction parameters for multiple particles, each particle having a ground state, an excited state, and one or more intermediate states The multiple particles are configured to interact with a plurality of electromagnetic fields associated with a (different) transition between two states. The method comprises performing a spectroscopy measurement, measuring an effective Rabi frequency Ωeff, measuring a single-photon Ramsey frequency ΩR i , and determining the interaction parameters based on the measured effective detuning δ eff, the measured effective Rabi frequency Ωeff, and the measured single-photon Ramsey frequencies ΩR i . The interaction parameters may be determined for each of the multiple particles. The interaction parameters may comprise a single-photon Rabi frequency Ω i for each electromagnetic field, which may be used to align the electromagnetic fields with respect to the particles.

A method for improving the operation of an OLED includes maximizing non-radiative transfer of excited state energy from the OLED's organic emissive material to surface plasmon polaritons in an enhancement layer by providing the enhancement layer no more than a threshold distance away from the organic emissive layer; and emitting light into free space from the enhancement layer by scattering the energy from the surface plasmon polaritons through an outcoupling layer that is provided proximate to the enhancement layer but opposite from the organic emissive layer.

The invention provides a broadband frequency hopping device based on high-orbital angular momentum Rydberg atoms. An atomic air chamber comprises the high-orbital angular momentum Rydberg atoms; the first reflecting mirror and the second reflecting mirror are respectively used for reflecting the detection light and the coupling light to the atom gas chamber so as to excite high-orbital angular momentum Rydberg atoms from a ground state to an excited state and pump the high-orbital angular momentum Rydberg atoms to a first Rydberg state; the first microwave generator, the second microwave generator and the third microwave generator are used for enabling high-orbital angular momentum Rydberg atoms to be transited to a second Rydberg state, a third Rydberg state and a fourth Rydberg state respectively; and the photoelectric detector is used for receiving the detection light passing through the atomic gas chamber. According to the invention, frequency hopping crossing 6 octaves can be realized, the frequency hopping speed is 60khops / s, and the frequency hopping point number is expanded under the limited instantaneous bandwidth by using the microwave frequency comb. The method has potential application value in the field of secret radio communication.

A system for generating photon emission from atomic nuclei includes a device for generating phonons, and a condensed matter medium comprising atomic nuclei. The phonons interact with the atomic nuclei and affect nuclear states of some of the atomic nuclei by transferring energy to the nuclei and causing the nuclei to emit photons. The condensed matter medium includes excited Fe-57* nuclei and ground state Fe-57 nuclei, and the device for generating phonons comprises one of laser irradiation, electric current, diffusion of solutes in solid solutions, or particle beam bombardment.

The invention provides a substance detection system and method and diagnostic equipment, and belongs to the technical field of electron diffraction, and the substance detection system comprises an electron emission module, a laser emission module and a detection module. The electron emission module comprises an electron emitter and a grid electrode. The electron emission module is used for emitting electronic pulses to the to-be-detected sample in the excited state. The grid electrode is arranged on the periphery of the electron emitter and regulates and controls electron beams emitted by the electron emitter. The laser emission module is used for emitting laser pulses to a to-be-detected sample, so that the to-be-detected sample reaches an excited state. And the detection module is used for detecting detection signals obtained by the laser emission module and the electron emission module acting on the to-be-detected sample. The electronic emission module, the laser emission module and the detection module are arranged to be in mutual time synchronization. According to the substance detection system and method provided by the invention, the dynamic process of different substances in different time scales can be represented, and the technical problem that the application range of a traditional system is narrow is solved.

Selective frequency dissipation is implemented that enables cooling of energy gap protected qubits such that excited energy states resulting from heating or other undesired processes are returned to a lower excited energy state or a ground state manifold, thus reducing the probability of errors. Also, the selective frequency dissipation inhibits leakage from the energy gap protected qubits when in the ground state. Additionally or alternatively, Hamiltonian engineering by inducing parity rotations is implemented to decouple the wells of the energy gap protected qubit to further reduce errors when leakage does happen.

A method for optimizing a quantum operation to be applied on at least two quantum objects of a system of quantum objects, the method including the determination of an optimized pulse to be generated by at least one controlled laser for implementing the quantum operation on the at least two quantum objects while fulfilling a robustness criterion, the at least two quantum objects having a quantum state depending on the excitation level of the at least two quantum objects, the excitation level being chosen between 01, 10 and 11, 0 defining a de-excited state for a quantum object and 1 defining an excited state for a quantum object, the quantum state having a zero order term and a first order term.

The application relates to a tunable light-quantum memory entanglement generation device based on atomic transition interference and belongs to the technical field of quantum information science technology. In the application, a multi-energy-level atomic system is used as an atomic medium for preparing a quantum memory; atoms in an initial state in the atomic medium are transitioned to a coherent superposition state of multiple excited states under the action of excitation light; the atoms in the coherent superposition state of the multiple excited states are transitioned to a ground state, forming a coherent superposition state of multiple light-quantum memory entangled states, that is, atomic transition interference occurs; the frequency of the excitation light can be adjusted to change the coefficients of the coherent superposition of the light-quantum memory entangled states, so that the photons output from the atomic medium and the quantum memory of the spin state of the storage atom are in a tunable quantum entangled state. In the application, each component for preparing the tunable light-quantum memory entanglement can be obtained from a mature optoelectronic device.

The present disclosure relates to a system for performing a quantum manipulation protocol, e.g., a quantum computing algorithm, the system comprising: a trapping laser system for trapping neutral atoms in an optical trap array inside a vacuum chamber operated at a trapping wavelength λtr, wherein each neutral atom comprises a ground state |1S0>, a first metastable excited state |3P0> and a second metastable excited state |3P2>. The system further comprises a state manipulation laser system for generating laser radiation for coupling, via a phase-coherent multi-photon transition, the ground state |1S0> to the first metastable excited state |3P0> and / or to the second metastable excited state |3P2> as well as a magnetic field system for generating a magnetic field Bext at a location of the optical trap array inducing a Zeeman splitting for magnetic substates of the second metastable excited state |3P2>. The system further comprises a control system for controlling the laser radiation generated by the laser system to coherently modify a quantum state of the plurality of neutral atoms based on the quantum manipulation protocol and a quantum state readout system for determining the quantum state of at least a subset of the plurality of neural atoms based on the quantum manipulation protocol. According to some aspects, a direction of the magnetic field Bext with respect to a polarization direction of the optical trap array is selected such as to render the optical trap array operated at the trapping wavelength λtr a magic- wavelength optical trap for the second metastable excited state |3P2> and the first metastable excited state |3P0> and / or for the second metastable excited state |3P2> and the ground state |1S0> or both. A state-selective detection scheme as well as related devices and methods are also disclosed.

The invention relates to the technical field of atom magnetometer detection and quantum sensing, and discloses a helium atom metastable state excitation density detection method, which comprises the following steps: constructing a detection system comprising a distributed feedback laser, a helium atom gas chamber, an excitation circuit and an oscilloscope; respectively acquiring an unexcited state transmission light signal, an excited state transmission light signal and a background signal by using an oscilloscope; spontaneous radiation interference is eliminated through background subtraction, laser power fluctuation is eliminated through normalization, and the helium atom metastable state excitation density is obtained through inversion according to the Lambert-Beer law. According to the invention, the helium atom metastable state excitation density inverted in real time is used as a feedback basis, and the density change is monitored to lock the optimal resonance point and impedance matching parameters of the excitation circuit. According to the invention, the influence of plasma discharge interference and laser power fluctuation is effectively eliminated, the measurement signal-to-noise ratio and accuracy are improved, and the preparation efficiency of metastable helium atoms is maximized.

The application discloses a method for preparing a two-dimensional ultracold atomic gas by optimizing adiabatic compression, and belongs to the technical field of ultracold atomic physics and optical lattice. The method takes the quantum adiabatic evolution of a three-dimensional ultracold atomic gas in an adjustable period optical lattice as a physical model basis, and equivalently describes the motion of atoms in the lattice bound direction as a one-dimensional quantum harmonic oscillator system varying with an external parameter. In the lattice compression process, the instantaneous energy level structure of the system evolves with time, and the minimum energy gap region between the lowest energy level and the first excited state is the main source of non-adiabatic transition. A non-adiabatic parameter is introduced to simultaneously describe the relationship between the instantaneous energy gap and the scanning rate of the parameter, which is used for quantitative evaluation of the adiabaticity of the system, and the Landau-Zener non-adiabatic transition model is combined to design and optimize the scanning curve of the lattice compression. The scheme can effectively reduce the probability of non-adiabatic excitation in the compression process, and significantly shorten the lattice compression time under the premise of ensuring the adiabatic evolution of the system.

Topological qubits are provided in a quantum spin liquid. In various embodiments, a device is provided comprising a two-dimensional array of particles, each particle disposed at a vertex of a ruby lattice having a parameter ρ greater than12;each particle having a first state and an excited state; each particle that belongs to at least three unit cells of the ruby lattice having a blockade radius, when in the excited state, sufficient to blockade each of at least six nearest neighboring particles in the ruby lattice from transitioning from its first state to its excited state, and wherein the array has at least one outer edge configured to be in a first boundary condition.

The application discloses a kind of method and system for measuring atomic beam flow velocity, the method excites the atom in ground state in the first resonance laser in the second resonance action area, and the first resonance laser is the laser that frequency is locked on the first resonance transition spectral line of atom;After the intensity of detected fluorescent signal reaches the first stable amplitude value, the atom in ground state in the first resonance action area is excited by the second resonance laser at the first time point, and the second time point when fluorescent signal intensity starts to weaken is determined, the second resonance laser is the laser that frequency is locked on the second resonance transition spectral line of atom, and the excited state energy level lifetime of the second resonance transition spectral line of atom is longer than the first resonance transition spectral line;According to the determined atomic transit displacement and atomic transit time, the velocity information of atomic beam flow is determined.The application solves the problem that the previous experiment calculates the velocity of atomic beam flow, and the measurement precision is poor, the reliability is low, and the practical measurement verification is lacked.

The invention discloses a laser molecule with cascade excited state double proton transfer activity, a single crystal material and a preparation method and application of the laser molecule and the single crystal material. According to the invention, the laser molecule with a specific structure and cascade excited state double proton transfer activity is designed, so that the J-type aggregate can be spontaneously formed; by utilizing the intermolecular coupling effect of J-type aggregation, the excited state energy of the tautomer B is effectively reduced, and two times of proton transfer are promoted to be completely completed in thermodynamics. The thorough cascade excited state double-proton transfer process can avoid excited state particle shunting loss and promote excitons to release energy through an excited radiation channel, so that the utilization rate of the excitons is remarkably improved, sufficient population inversion intensity and optical gain are guaranteed, and the photoelectric conversion efficiency is improved. Finally, the core problems that an existing near-infrared organic solid laser is low in exciton utilization rate and insufficient in optical gain are solved, and ultralow-threshold near-infrared laser emission is achieved.

The application discloses a high-sensitivity microwave receiving system and method with atomic polarization enhancement, and the system comprises a first laser, an atomic gas chamber, a second laser, a dichroic mirror, a photodetector, a first signal source, a second signal source, a first antenna, a second antenna and a host computer. The method is characterized in that: the first signal source is used to generate a pulsed microwave field to prepare an atomic initial state to a specific ground state; the first laser is used to generate detection light which is resonant with an atomic ground state and a metastable state energy level transition; the second laser is used to generate coupling light which is resonant with an atomic excited state and a Rydberg state energy level transition; the detection light and the coupling light are used to excite the atom to the Rydberg state; the second signal source is used to generate a microwave field which is jointly used to cause periodic changes of atomic energy levels, and the microwave field is used to generate periodic modulation on the intensity of the detection light; the power of the modulation signal is proportional to the power of a to-be-measured microwave, and the to-be-measured microwave receiving measurement is realized. The atomic polarization enhancement method can increase the number of atoms participating in the microwave measurement, and improve the microwave receiving performance.

According to an embodiment, an arrangement for quantum computing comprises: a first quantum system having a plurality of Fock quantum states comprising at least a zero-photon state, a one-photon state, and a two-photon state; and a second quantum system coupled to the first quantum system and comprising at least a ground state and one or more excited states and is configured to, via the coupling, cause at least one of the one or more excited states to hybridize with the two-photon state of the first quantum system causing the two-photon state to split into a first hybridized state and a second hybridized state, wherein an energy difference between the one-photon state and the first hybridized state is non-equal to an energy difference between the zero-photon state and the one-photon state and an energy difference between the one-photon state and the second hybridized state is non-equal to the energy difference between the zero-photon state and the one-photon state.

Methods and apparatus for generating quantum entanglement links between matter qubits in a quantum communication system A matter qubit may be arranged in an optical cavity configured to stimulate photon emission and an energy level transition from an excited state energy level to a third ground state energy level. The matter qubit may be initialised in a superposition of a first ground state energy level and a second ground state energy level. The matter qubit may be exposed to a first instance of an excitation field configured to excite the matter qubit from the second ground state energy level to the excited state energy level. The matter qubit may be subjecting to a control field configured to cause an energy level transition from the first ground state energy level to the second ground state energy level before being exposed to a second instance of the excitation field.

Techniques are described for deterministically returning Rydberg atoms from a Rydberg state to a ground state. These techniques allow for improved calibration of Rydberg excitations, and for detection of errors without the loss of atoms from traps described above. In particular, the techniques comprise applying a pulse to a Rydberg atom to transition the atom from a Rydberg state to a second state having a lower energy than the Rydberg state. These pulses, referred to here as “drain pulses,” are selected to produce the desired transition to the second state, referred to herein as a “drain state.” The drain state may be selected as a state that will decay, or which may be driven, to a ground state. Accordingly, the drain pulse provides a path for atoms to transition from a Rydberg state to a ground state.

Methods, systems and apparatus for implementing a quantum gate on a quantum system comprising a second qubit coupled to a first qubit and a third qubit. In one aspect, a method includes evolving a state of the quantum system for a predetermined time, wherein during evolving: the ground and first excited state of the second qubit are separated by a first energy gap ω; the first and second excited state of the second qubit are separated by a second energy gap equal to a first multiple of ω minus qubit anharmoniticity η; the ground and first excited state of the first qubit and third qubit are separated by a third energy gap equal to ω-η; and the first and second excited state of the first qubit and third qubit are separated by a fourth energy gap equal to the first multiple of the ω minus a second multiple of η.

The invention discloses a quantum memristor system, an operation method, a quantum computing system and a storage medium, and relates to the technical field of quantum computing. The quantum memristor system comprises an ion trapping module, a quantum state initial module, a quantum state regulation and control module and a quantum state reading module, an adopted trapping ion ground state has a hyperfine energy level structure, and clock state transition can be formed between a first energy level and a second energy level in the hyperfine energy level structure. The write-in operation is that microwave pulses are applied to the trapped ions to completely or partially transfer the population from a first energy level to a second energy level, and radio frequency pulses are applied while or after the write-in operation to completely or partially transfer the population of the second energy level to a third energy level to realize state mixing and memory; according to the quantum memristor, the energy level control architecture of the quantum memristor is constructed by adopting the full ground state energy level of trapping ions, rapid decoherence introduced by excited state spontaneous radiation is avoided, and the quantum memristor is insensitive to magnetic field noise, good in stability and long in memory time.

A method and system are provided for estimating ground state and excited state energies of fermionic Hamiltonians using a classically-boosted Variational Quantum Eigensolver (VQE). The disclosed technology overcomes the drawbacks of prior VQE methods, which require large numbers of circuit repetitions and excessive runtimes to achieve precision, especially when implemented using Noisy Intermediate-Scale Quantum NISQ) devices. The disclosed classically-boosted VQE provides an estimation of expectation values using classical methods. The quantum computer is not used to prepare the trial state, but instead uses the difference between the trial state and a classical tractable approximation to the target state. Ground-state energy estimations are provided at an accelerated rate. Also, the measurement reduction of single basis state boosting of conventional VQE, may be estimated using only the overlap between the ground state and the computational basis state used for boosting.

The invention discloses a lithium isotope separation method based on selective resonance excitation, and belongs to the technical field of isotope separation. According to the method, isotope displacement caused by nuclear mass difference of lithium-6 and lithium-7 is utilized, in an aqueous solution, molten salt or molten metal system, coherent radiation with corresponding characteristic frequency is adopted to carry out selective resonance excitation on lithium-6, so that lithium-6 is in a high-energy excited state, and the lithium is converted into lithium. Therefore, differences of lithium-6 and lithium-7 in physical and chemical properties such as crystallization behavior, phase change trend, phase distribution behavior and the like are amplified; excited state distribution is maintained through continuous irradiation, the limitation of short service life of the excited state on macroscopic separation is overcome, and lithium is enriched through conventional separation steps such as cooling crystallization, directional solidification and extraction. The method can be implemented in a conventional industrial system, does not need a high-vacuum or atomization device, has the advantages of high separation efficiency, mild process, greenness, safety, easiness in large-scale production and the like, and is suitable for preparing high-abundance lithium-6 in the fields of nuclear fusion and nuclear industry.

The invention discloses a quantum mechanical model construction method and system based on a GPU cluster and mode awareness, and relates to the technical field of data processing. The method comprises the following steps: acquiring a reference state, a single electron integral and a double electron integral of a target chemical system; constructing a Hamiltonian matrix according to the reference state, the single electron integral and the double electron integral, and obtaining the energy of the reference state through diagonalizing the Hamiltonian matrix; excited states are generated according to electron transition of the reference state, the excited states are divided into multiple groups, and each group is shrunk into a shrunk state; constructing a new Hamiltonian matrix according to the reference state, the contraction state, the single electron integral and the double electron integral, and solving an eigenvector corresponding to the minimum eigenvalue of the new Hamiltonian matrix; and constructing a quantum mechanical model for describing the target chemical system according to the eigenvector, the reference state and the contraction state. According to the method, the building efficiency of the quantum mechanical model and the calculation efficiency of the physical property can be improved.