54 results about "Quantum emitter" patented technology

A fault-tolerant quantum computing scheme implements quantum computing based on three-dimensional cluster states using just a small number of physical components. The technique may be implemented using a single actively controlled qubit [100], e.g., a quantum emitter, and a pair of delay line loops [106, 108], which can be physically realized using existing technologies in quantum photonic and phononic systems. A three-dimensional cluster state is prepared by using the actively con-trolled qubit to generate data qubits that propagate through the two delay line loops, interact with the actively controlled qubit, and then are measured by a detector [110].

An embodiment provides for distribution of an entangled state (e.g., GHZ state, etc.) through use of an optical channel coupled with electron-nuclear memories, such as silicon vacancy quantum memories, and near-deterministic Bell measurements between electronic spins. The embodiment provides electron-nuclear spin swapping and deterministically generates electron-electron entanglement. Nuclear spins can be used for memories, and repeated Bell measurements can be used to generate entanglements between electrons. Thus, the embodiment obtains a deterministic GHZ projection and prepares the GHZ state in fixed circuit depth.

Systems and methods are described for implementing quantum key distribution (QKD) in a data center environment. An example quantum transmitter includes an on-chip semiconductor laser as a light source to generate photons, quantum state preparation circuitry configured to receive a sequence of bits, map each bit to a quantum state and a measurement basis, and encode the quantum state of each bit onto a corresponding photon to generate a qubit, and a quantum channel interface configured to transmit the qubit to a quantum receiver via a quantum communication channel. An example quantum receiver includes a quantum channel interface to receive qubits, a silicon-based single photon avalanche diode (SPAD) as a photon detector for qubit detection, and quantum state measurement circuitry that is configured to decode the state of each qubit based on a selected measurement basis.

The invention discloses single-photon non-destructive measurement equipment based on a micro-ring resonant cavity, and the equipment comprises a signal light input waveguide, a signal light output waveguide, a detection light input waveguide, a detection light output waveguide, a first optical circulator, a second optical circulator, a linear waveguide, the micro-ring resonant cavity, and a three-level quantum emitter. The first ends of the signal light input waveguide, the probe light output waveguide and the linear waveguide are respectively connected to the first optical circulator, the second ends of the signal light output waveguide, the probe light input waveguide and the linear waveguide are respectively connected to the second optical circulator, and the micro-ring resonant cavity is coupled with the linear waveguide. And the three-level quantum emitter is coupled with the micro-ring resonant cavity. The method is high in measurement efficiency and high in measurement precision.

A method and devices for fabricating optical emitters. The method includes disposing a flake of a multi-layer material onto a wafer. The wafer has an aperture over which a portion of the flake is disposed. The flake has a first surface partially in contact with the wafer, and a second surface opposite the first surface. The method further includes disposing a deceleration mask layer adjacent the flake. The deceleration mask layer has a flake-side surface adjacent to the flake, and an exposed surface opposite the flake-side surface. An ion beam is directed at the exposed surface of the deceleration mask layer to decelerate ions of the ion beam until at least a portion of the ions are implanted in the flake.

A molecular sensing device and molecular sensing method that are based on quantum plexcitonic states on strongly coupled nanophotonic systems are disclosed. The molecular sensing device includes a metasurface, a layer of a semiconducting and / or dielectric material disposed onto a layer of electrically conducting material, a metal nanohole array disposed onto the metasurface, a biological recognition element disposed onto a surface of the metal nanohole array, and where the surface of the metal nanohole array is configured to receive a bioanalyte and a plurality of quantum emitters. The molecular sensing device can be a mixture of quantum emitters, comprising gold, having more than one aspect ratio. The molecular sensing device may include a spectroscopic instrument, including a portable detector. The one or more biological recognition elements are configured to recognize a communicable disease in response to the presence of a specific biological recognition element.

To provide a quantum transmitter enabling self-tuning of the hardware of a QKD transmitter, a method for optimizing, a quantum transmitter, a method for training, and a quantum communication system.SOLUTION: A method according to the present invention is a method for optimizing a transmitter using a reinforcement learning (RL) agent including a control unit to which a plurality of control signals defined by a set of a plurality of control parameters are applied and an optimization unit. The optimization unit sets the plurality of control parameters by performing reinforcement learning using a policy and the agent. The agent receives a plurality of observations of an environment, by moving through a control parameter space and obtaining scores indicative of the quality of the transmitter for a plurality of neighboring locations in the control parameter space, navigates a path through the control parameter space from first estimates of the plurality of control parameters to target settings for the plurality of control parameters, and is trained using a plurality of different quantum transmitters.SELECTED DRAWING: Figure 9

There is herein disclosed a quantum transmission apparatus for Quantum Key Distribution (QKD), comprising: a first quantum transmitter and a second quantum transmitter, wherein, in use, the first quantum transmitter prepares a first photon for QKD transmission and the second quantum transmitter prepares a second photon for QKD transmission; a multiplexer for multiplexing the first photon and the second photon onto a quantum output channel using wavelength-division multiplexing; and a transmission processing apparatus, wherein, in use, the transmission processing apparatus: performs processing in relation to generating a quantum key associated with the first photon; and performs processing in relation to generating a quantum key associated with the second photon.

A device having a layered structure including a layer of phase change material and a layer of host material having embedded quantum emitters is tuned. An electric field is applied through the layer of host material and the layer of phase change material to change an emission wavelength of the quantum emitters. A phase of the phase change material is changed in each of one or more local regions of the phase change material in a non-volatile manner to form a local change opposite a corresponding one of the quantum emitters in the layer of host material to locally change the electric field at the corresponding quantum emitter.

The invention provides a spontaneous radiation active control system based on hyperbolic structure deflection regulation, which relates to the technical field of quantum photon regulation and comprises a hyperbolic dispersion structure layer, a quantum emitter, a nano waveguide and a substrate, the quantum emitter is used for emitting spontaneous radiation photons to be regulated and controlled; the hyperbolic dispersion structure layer is used for processing spontaneous radiation photons to be regulated and controlled based on self anisotropic dielectric characteristics and an optical axis rotation regulation and control principle to obtain processed radiation photons with changed radiation intensity; the nano waveguide is used for collecting and guiding transmission of the processed radiation photons to obtain guided wave photons which can be effectively utilized; and the substrate is used for providing a stable mechanical supporting platform for the hyperbolic dispersion structure layer, the quantum emitter and the nano waveguide. On the basis, the problem that flexible adjustment is limited by fixed parameters is solved, the flexibility, efficiency and bandwidth adaptability of spontaneous radiation regulation and control are improved, and practical application breakthrough of the high-performance quantum light source and related devices is achieved.

The invention concerns a method for enhancing the privacy of delegated quantum computations, involving: a client (A) whose aim is to solve a computational problem based on sensitive data and / or using a sensitive algorithm, and a cloud computing service provider (B) who has quantum computing capacities superior to the client (A) and is therefore capable of solving the problem and / or running the client's desired algorithm; wherein the method comprises a sequence including the following steps: a) a light emitter (10) controlled by the client (A) emits at least one pulse (11) having a specific quantum state (S1), b) a quantum emitter (20) controlled by the provider (B) receives the pulse (11), c) the quantum emitter (20) emits a single photon (21) supporting a photonic qubit (Q2), with a relationship being defined between the quantum state (S1) of the pulse (11) and the photonic qubit (Q2). The invention also concerns a system for implementing this method.

The application provides a spontaneous radiation active control system based on deflection regulation of a hyperbolic structure, relates to the technical field of quantum photon regulation, and comprises a hyperbolic dispersion structure layer, a quantum emitter, a nano waveguide and a substrate; the quantum emitter is used for emitting spontaneous radiation photons to be regulated; the hyperbolic dispersion structure layer is used for processing the spontaneous radiation photons to be regulated based on the anisotropic dielectric characteristics and the optical axis rotation regulation principle of the spontaneous radiation photons to be regulated, so that processed radiation photons with changed radiation intensity are obtained; the nano waveguide is used for collecting and guiding transmission of the processed radiation photons, so that guided wave photons that can be effectively utilized are obtained; and the substrate is used for providing a stable mechanical support platform for the hyperbolic dispersion structure layer, the quantum emitter and the nano waveguide. Therefore, the problem of flexible adjustment limited by fixed parameters is solved, the flexibility, the efficiency and the bandwidth adaptability of spontaneous radiation regulation are improved, and a practical application breakthrough of a high-performance quantum light source and related devices is realized.

A quantum computing method includes providing at least one resonator-coupled quantum emitter configured to function as an entangling gate, receiving a plurality of graph states, at least some of the plurality of graph states representing a relationship between qubits therein, and wherein at least one of the qubits in at least two of the plurality of graph states is a photonic qubit, selecting the at least one photonic qubit from each of the at least two of the plurality of graph sates, interacting the selected qubits with the at least one resonator-coupled quantum emitter, and disentangling the at least one resonator-coupled quantum emitter from the selected qubits.

The invention relates to a tunable nanobeam cavity resonator (100) comprising a first optical cavity (102) a second optical cavity (104) optically coupled to the first optical cavity (102) an electrically conductive portion (106) and an electrode (108), wherein the first optical cavity (102) and / or the second optical cavity (104) comprise / comprises a quantum emitter configured to host a qubit. The first optical cavity (102) and the second optical cavity (104) are provided in the tunable nanobeam cavity resonator (100) such that there is a gap (110) between the first optical cavity (102) and the second optical cavity (104). The electrically conductive portion (106) is configured to move with respect to the electrode (108) and the first optical cavity (102) when a voltage between the electrically conductive portion (106) and the electrode (108) is applied; and the electrically conductive portion (106) is mechanically connected to the second optical cavity (104) such that movement of the electrically conductive portion (106) causes movement of the second optical cavity (104) with respect to the first optical cavity (102) to adjust the gap (110) between the first optical cavity (102) and the second optical cavity (104).

A quantum light source includes a quantum emitter located within both a bullseye cavity and a Fabry-Perot cavity. The Fabry-Perot cavity is formed from first and second mirrors that face each other to define an optical axis extending therebetween. The bullseye cavity lies in a plane perpendicular to the optical axis and in between the first and second mirrors. The quantum emitter may be a quantum dot, a point defect in a crystal (e.g., nitrogen-vacancy center in diamond), an atom, or another type of quantum system. Spontaneous emission from the quantum emitter is strongly coupled into a mode of the Fabry-Perot cavity while the bullseye cavity uses destructive interference to prevent emission of photons along directions transverse to the axis of the Fabry-Perot cavity. Light leaks out of the Fabry-Perot cavity into a well-defined traveling-wave mode that can be efficiently coupled to an optical fiber.

The present invention relates to a tunable nanobeam cavity resonator (100), the tunable nanobeam cavity resonator comprising: a first optical cavity (102); a second optical cavity (104), the second optical cavity being optically coupled to the first optical cavity (102); a conductive portion (106); and an electrode (108), wherein the first optical cavity (102) and / or the second optical cavity (104) comprises a quantum emitter configured to carry quantum bits. The first optical cavity (102) and the second optical cavity (104) are disposed in the tunable nanobeam cavity resonator (100) such that there is a gap (110) between the first optical cavity (102) and the second optical cavity (104). The conductive portion (106) is configured to move relative to the electrode (108) and the first optical cavity (102) when a voltage is applied between the conductive portion (106) and the electrode (108); the conductive portion (106) is mechanically connected to the first optical cavity (102) and the conductive portion (106) is mechanically connected to the second optical cavity (104) such that movement of the conductive portion (106) causes movement of the second optical cavity (104) relative to the first optical cavity (102) to adjust the gap (110) between the first optical cavity (102) and the second optical cavity (104).

The present invention relates to a method for enhancing the privacy of delegated quantum computing, the method comprising a client (A) whose objective is to solve a computational problem based on sensitive data and / or using a sensitive algorithm, and a cloud computing service provider (B) which has superior quantum computing capabilities to the client (A) and is therefore capable of solving the problem and / or executing the client's desired algorithm, the method comprising a sequence including a) an optical emitter (10) controlled by the client (A) emits at least one pulse (11) having a specific quantum state (S1); b) a quantum emitter (20) controlled by the provider (B) receives the pulse (11); and c) the quantum emitter (20) emits a single photon (21) supporting a photon qubit (Q2), thereby defining a relationship between the quantum state (S1) of the pulse (11) and the photon qubit (Q2). The present invention also relates to a system for carrying out this method.

A single photon emitter having a ferroelectric film on a substrate, a monolayer or thin film formed on the ferroelectric where the monolayer or thin film contains a single photon emitter, a conductive contact layer formed over a portion of the monolayer or thin film, and an electrical contact adapted to selectively apply a bias voltage to the conductive layer. The ferroelectric film may comprise poly (vinylidene fluoride-co-trifluoroethylene). The monolayer or thin film formed on the ferroelectric may comprise WS2. Also disclosed is the related method of forming a single photon emitter.

There is herein disclosed a quantum transmission apparatus for Quantum Key Distribution (QKD), comprising: a plurality of components, wherein in use, the plurality of transmission components co-operate to perform QKD, wherein one or more of the plurality of transmission components is functionally disconnectable from, and functionally re-connectable to, a remainder of the plurality of transmission components, for performing QKD, the plurality of transmission components comprising: a first quantum transmitter, adapted to prepare a first photon for QKD transmission; a second quantum transmitter, adapted to prepare a second photon for QKD transmission; and a multiplexer for multiplexing the first photon and the second photon onto a quantum output channel.

A quantum computing system, method, and computer readable medium involves initializing a state of a resonator-coupled quantum emitter having at least four levels arranged in an N-configuration, the N-configuration having a first ground state, a second ground state, a first excited state and a second excited state. A frequency of a first transition between the first ground state and the first excited state is tuned, a frequency of a second transition between the second ground state and the second excited state is tuned, and a frequency of a third transition between the second ground state and the first excited state is tuned. A plurality of photons are fed at a frequency corresponding to the frequency of the second transition, thereby entangling the plurality of photons to the resonator-coupled quantum emitter. Likewise, a photon at a frequency corresponding to the frequency of at least one of the first transition or the third transition is fed, thereby mapping a state of the resonator-coupled quantum emitter into a photon.

Systems and methods relate to electrically manipulating optical quantum systems. Quantum emitters can be coupled to an electric field exerted across an integrated lateral reverse-biased semiconductor diode. This electric field exerted through the reverse-biased diode can broaden, narrow, and / or shift de-excitation photon wavelengths. Such emitter-field coupling of quantum emitters embedded in semiconductor diodes can produce stabilized and tunable de-excitation photon emission. Such stabilization and tuning can allow for the coherent transmission of entangled photon quantum states. Individual quantum emitters or large ensembles of quantum emitters can be hosted in semiconductor diodes constructed by ordinary lithographic techniques within versatile media. The designs and techniques disclosed can facilitate scalable, efficient production of semiconductor diode and embedded quantum emitter devices for manipulable, deterministic transmission of quantum information.

The invention relates to a coherent single photon source (100) comprising: a nanodiamond (120) having a quantum emitter (140), wherein the nanodiamond (120) and the quantum emitter (140) are designed and configured such that the quantum emitter (140) emits coherent, indistinguishable photons (160). The invention further relates to a system (300) comprising: a first coherent single photon source (101); and a second coherent single photon source (102); wherein the first coherent single photon source (101) and the second coherent single photon source (102) are designed and configured such that photons (160) emitted from a first quantum emitter (151) of a first nanodiamond (121) of the first coherent single photon source (101) are indistinguishable from photons (160) emitted from a second quantum emitter (152) of a second nanodiamond (122) of the second coherent single photon source (102).

1. Name of the product in this design: Quantum Emitter (Quantum Energy Analyzer). 2. Purpose of this design: A device for emitting multi-band electromagnetic waves. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

Systems and methods relate to electrically manipulating optical quantum systems. Quantum emitters can be coupled to an electric field exerted across an integrated lateral reverse-biased semiconductor diode. This electric field exerted through the reverse-biased diode can broaden, narrow, and / or shift de-excitation photon wavelengths. Such emitter-field coupling of quantum emitters embedded in semiconductor diodes can produce stabilized and tunable de-excitation photon emission. Such stabilization and tuning can allow for the coherent transmission of entangled photon quantum states. Individual quantum emitters or large ensembles of quantum emitters can be hosted in semiconductor diodes constructed by ordinary lithographic techniques within versatile media. The designs and techniques disclosed can facilitate scalable, efficient production of semiconductor diode and embedded quantum emitter devices for manipulable, deterministic transmission of quantum information.

A method of encoding quantum information on one or several degrees of freedom of coherent states of photons of a baseband input optical signal, a quantum transmitter, and a computer-readable medium. The quantum transmitter comprises a modulator configured to encode quantum information on one or several degrees of freedom of coherent states of photons of a baseband input optical signal using sideband modulation of the baseband optical input signal.

The disclosure describes an adaptive and optimal imaging of individual quantum emitters within a lattice or optical field of view for quantum computing. Advanced image processing techniques are described to identify individual optically active quantum bits (qubits) with an imager. Images of individual and optically-resolved quantum emitters fluorescing as a lattice are decomposed and recognized based on fluorescence. Expected spatial distributions of the quantum emitters guides the processing, which uses adaptive fitting of peak distribution functions to determine the number of quantum emitters in real time. These techniques can be used for the loading process, where atoms or ions enter the trap one-by-one, for the identification of solid-state emitters, and for internal state-detection of the quantum emitters, where each emitter can be fluorescent or dark depending on its internal state. This latter application is relevant to efficient and fast detection of optically active qubits in quantum simulations and quantum computing.

Apparatuses, systems, computing devices, switches, network endpoints, and methods to enable quantum key distribution (QKD). Systems include a QKD circuit to encode one or more photons according to respective quantum states and a quantum transmitter circuit to enable the encoded photons to transmit via an optical communication channel.

Method for manufacturing a measuring probe (14), comprising the following steps: Insertion of two optical fibers (24, 26) and two electrical conductors (30, 32) into a sleeve (36); Filling the sleeve (36) with a carrier material, wherein the carrier material surrounds the glass fibers (24, 26) and / or electrical conductors (30, 32) at least partially; Curing of the carrier material in the sleeve (36); Polishing one end of the glass fibers (24, 26), electrical conductors (30, 32) and / or the carrier material contained in the sleeve (36); Arranging an RF antenna (34) on the top; and Transferring a quantum emitter (28) to the tip; Laser writing of a first and second optical fiber structure (42, 44) for optical connection of the quantum emitter (28) to the first optical fiber (24) and to the second optical fiber (26), wherein the first optical fiber (24) is optically decoupled from the second optical fiber (26).

A quantum transmitter 501 for use in a quantum communication system is provided, the transmitter comprising: a plurality of quantum state encoders 108, each encoder configured to emit portions of light, each portion encoded with a respective quantum state; and a beam combining module 402 configured to receive portions of light emitted from each quantum state encoder, and combine the received portions to produce output light comprising a sequence of successive portions of light emitted by each encoder. A corresponding quantum communication system is also provided. The output from the beam combiner may be time-division multiplexed pulses from respective encoders. The time division may be effected using different delays in the lines between encoder and combiner or may be effected with offset drive signals to the encoders or with selective switching at the combiner. Using multiple encoders allows an increased pulse rate and also provides redundancy in case an encoder fails. The encoders may output light with a common wavelength. [Figure 5]