33 results about "Atomic system" patented technology

An atomic magnetometer that simultaneously achieves high sensitivity, simple fabrication and small size. This design is based on a diverging (or converging) beam of light that passes through an alkali atom vapor cell and that contains a distribution of beam propagation vectors. The existence of more than one propagation direction permits longitudinal optical pumping of atomic system and simultaneous detection of the transverse atomic polarization. The design could be implemented with a micro machined alkali vapor cell and light from a single semiconductor laser. A small modification to the cell contents and excitation geometry allows for use as a gyroscope.

Atomic testing of a multiplicity of scenarios includes generating a listing of interacting scenarios which are likely to cause a failure, and testing ones of the scenarios not included in the listing according to a binary search strategy to identify a subset of the scenarios as a source of failure among the scenarios. Additionally, the listing can be updated with newly identified interacting scenarios which are likely to cause a failure.

The invention relates to a continuous variable entanglement distillation device between atomic ensembles, which belongs to the technical field of continuous variable entanglement distillation. The continuous variable entanglement distillation device with good reliability and easy implementation provided by the invention is characterized by comprising a light source unit, first and second optical fiber channels, first and second optical choppers, first and second atomic systems, and a measurement system, wherein the light source unit is connected with input ends of the first and second opticalfiber channels respectively, an output end of the first optical fiber channel is connected with an input end of the first optical chopper, an output end of the second optical fiber channel is connected with an input end of the second optical chopper, an output end of the first optical chopper is connected with a first input end of the first atomic system, an output end of the second optical chopper is connected with a first input end of the second atomic system, the light source unit is connected with second input ends of the first and second atomic systems respectively, an output end of the first atomic system is connected with a first input end of the measurement system, an output end of the second atomic system is connected with a second input end of the measurement system, and the light source unit is connected with third and fourth input ends of the measurement system respectively. The continuous variable entanglement distillation device can be used in the field of quantum information.

The invention discloses a high resolution imaging device used for a cold atom system. The device comprises a disordered optical lattice generation path and an imaging light path, and is characterized in that the disordered optical lattice generation path comprises a laser beam and is composed of a first lens, a second lens, a diffusion barrier, a reflection mirror and a dichroic mirror along the laser beam direction in sequence; the first lens and the second lens form a beam expanding system; the reflection mirror and the dichroic mirror are in 45 degrees with the beam direction; the imaging light path comprises an imaging lighting beam and is composed of a vacuum pool, a third lens, a dichroic mirror, a fourth lens and a CCD (Charge Coupled Device) along the imaging lighting direction in sequence. According to the device, a laser speckle generation light path and an imaging light path are combined together, the purpose of loading disordered optical lattices to cold atom groups is realized by using an aberration elimination lens, the high resolution imaging of the atom groups is also realized, and the high resolution imaging device has the advantages of simple structure, high light path integration degree, less occupied space, adjustment convenience and the like.

The invention relates to a continuous variable light and atom ensemble entanglement production device and mainly aims at solving the technical problem of existing probable production of separated variable light and atom ensemble entanglement. According to the technical scheme, the continuous variable light and atom ensemble entanglement production device comprises a light source unit, a plurality of light beam coupling systems, an atom system and a measurement system. The light source unit is provided with a pump light pulse signal aP output end, a writing light pulse signal aW output end, a reading light pulse signal aR output end, an output end for two local oscillation light signals aL1 and aL2 and an output end for two simulation light pulse signals aL3 and aL4. The device utilizes orthogonal components of light fields in continuous variable quantum information and collective spin waves of atom ensembles to definitely produce Stokes light and atom ensemble entanglement through spontaneous Raman scattering process and conducts measurement and analysis on the light and atom ensemble entanglement through anti-Stokes light produced in the spontaneous Raman scattering process.

The invention discloses a method for preparing a spin-squeezed state of a cold atomic system, comprising: providing a two-component spin system, which includes a two-dimensional potential well, and the two-dimensional potential well has an atomic spin state dependent on atomic interaction The energy level structure of the energy level structure; Raman light is applied to the two-dimensional potential well, so that the spin interaction equivalently produced by the atomic interaction in the two-dimensional potential well is not zero; recording the self from the two-dimensional potential well The spin fluctuation signal is used to determine the change of the spin squeeze from the spin fluctuation signal; according to the change of the spin squeeze, the spin squeeze property is measured when the spin squeeze parameter is minimum, so as to generate the spin squeeze state. The invention has the advantages of simple implementation, breaking through the limitation of the quantum system measurement limit, providing a new method for improving the precision of quantum precision measurement, and making the spin squeezed state more stable.

Techniques for reconfiguring spectral features stored in a medium based on a two-state atomic system with transition dipole moment μ includes causing a chirp to pass into the medium. The chirp includes a monochromatic frequency that varies in time by a chirp rate κ over a frequency band BR during a time interval TR. The amplitude AR of the chirp is constant over BR and equal to AR=(hbar / μπ)√{square root over ((κ ln [2 / ε]))}, The term hbar is reduced Plank's constant, ln is a natural logarithm function, and π is a ratio of a circumference of a circle to a diameter of the circle. For ε<<1, the atomic-state populations in the two states are inverted. For ε=1, prior atomic-state populations are erased, with final populations equal in the two states, regardless of populations before erasure.

The invention discloses a method for optimizing information interaction in a system, which includes acquiring and analyzing system design data files, and constructing a system structure composition table, a system information composition table, and system input / output according to a fixed format according to the content of the system design data file information table; according to the system structure composition table and the system information composition table, analyze and obtain the atomic system of the system and the information interaction relationship between the atomic systems, and verify the completeness of the internal information of the system, and judge whether the information in the system design data file is all Enter the information interaction relationship between atomic systems; according to the information interaction relationship between atomic systems, analyze and obtain the atomic system set with information dependence relationship, and optimize the system structure according to the atomic system set with information dependence relationship.

The invention is an all-optical Rb frequency standard method and system. The method: firstly, adjusting the pump laser to the wavelength corresponding to Rb D2 line; then modulating semiconductor laser by radio signal to produce optical component needed to excite coherent resonance, and using two proper side bands to excite Rb 0-0 ultrafine coherent resonant transition; when the frequency of fine crystal oscillator deviates, the atomic system outputs a deviation correcting signal to control VCO, to make the VCO return to original frequency. The system is composed of semiconductor laser diode, Rb atomic physical system, optical signal detecting and amplifying device and high-precision constant temperature VCO, which are linked with one another. It uses Rb atomic coherent resonant transition chart line to identify the frequency, and the frequency locking is higher; needs no mechanical exciting system, avoiding the effect of mechanical system; uses commercial fractional laser diode as excitation source.

The invention discloses a method and device for acquiring an optical comb through an er-doped mode-locked fiber laser. The method comprises the steps that the repeated frequency of the optical comb generated by the er-doped mode-locked fiber layer and one mode of the optical comb are simultaneously locked on the three-level structure of a same atomic system to obtain the optical comb with a stable mode, so that a frequency source acquiring device is made to be compact in structure and small in occupied physical space, and therefore the demand for the portability of the frequency source device of applications such as optical fiber communication is met. The method and device can achieve output of laser comb-shaped spectral lines within the range from 1510 nm to 1610 nm, the time domain pulse width of lasers is 150 fs, and the average power is 40 mW. The long-term stability of the repeated frequency is 3E -12, and the long-term stability of a single mode is 7E-12. The index can meet the communication demand based on the optical comb, and great application potentiality is achieved in the optical fiber communication field.

The invention discloses a method for producing weak light and low-speed stable optical solitons, through incoherent pumping light Γ 21 Acting on the four-level inverted Y-type Rydberg cold atom system with a broadened lifetime, the interference between the atomic quantum states induced by light is used to eliminate the absorption of the incident light with weaker light intensity by the resonant medium, and obtain a larger Non-linear effects, stable PT symmetric optical solitons are obtained. The invention is simple and easy to understand, easy to realize and strong in practicability, can adjust related parameters according to actual conditions, and provides strong support for the in-depth application and development of optical solitons in the technical field of optical communication.

The invention relates to a continuous variable three-atom ensemble deterministic entanglement generating device, belonging to the technical field of atomic ensemble deterministic entanglement generating devices; the technical problem to be solved is to provide a continuous variable three-atom system with good reliability and easy realization. The improvement of the structure of the ensemble deterministic entanglement generating device; the technical solution adopted to solve the technical problem is: the light source unit is respectively connected with the first, second, and fourth input ends of the first, second, and third atomic ensembles, and the feedback system. The fourth, fifth, and sixth input terminals are connected to the fourth input terminal of the measurement system, and the first and second output terminals of the first, second, and third atomic ensembles are connected to the beam splitter network and the input terminal of the measurement system. , the output end of the beam splitter network is connected with the first, second and third input ends of the feedback system, and the first, second and third output ends of the feedback system are connected with the first, second and third atomic ensemble The third input end is connected; the invention can be widely used in the field of quantum information.