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公开(公告)号：US20220353067A1
公开(公告)日：2022-11-03
申请号：US17851769
申请日：2022-06-28
Applicant: EAGLE TECHNOLOGY, LLC
Inventor： VICTOR G. BUCKLEW , JAMES A. NAGEL , MICHAEL R. LANGE
Abstract: A quantum communications system includes a communications system that operates with a quantum key distribution (QKD) system, which includes a transmitter node, a receiver node, and a quantum communications channel coupling the transmitter node and receiver node. The transmitter node may be configured to transmit to the receiver node a bit stream of optical pulses, and switch between first and second QKD protocols based upon at least one channel condition.
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72.发明授权公开(公告)号：US11489670B2
公开(公告)日：2022-11-01
申请号：US16688999
申请日：2019-11-19
Applicant: QuNu Labs Pvt Ltd
Inventor： M T Karunakaran , Ganesh Yadav , Anindita Banerjee , Krishnan Rajesh Kumar
Abstract: A method for transmitting time information and quantum states on an optical medium is disclosed. The method includes transmitting information comprising a timing information and quantum states over a single wavelength on an optical medium. The method also includes receiving each transmitted information sequentially in the corresponding plurality of time slots at a receiver. The method also includes comparing each timing information received in the corresponding plurality of timeslots with timing information of a preceding hold over time slot of the plurality of time slots. The method also includes determining a time drift encountered at the receiver based on a compared result. The method also includes synchronising phase and frequency of the plurality of transmitted packets of the information based on minimization of determined time drift.
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公开(公告)号：US20220345301A1
公开(公告)日：2022-10-27
申请号：US17620397
申请日：2020-05-28
Applicant: ID Quantique SA
Inventor： Martyn BRAITHWAITE
Abstract: The present invention relates to a quantum key distribution method 2000 for distributing a secret key over a quantum communication channel between a transmitter and a receiver, the method comprising the steps of: synchronizing S2100 a clock between the transmitter and the receiver, distributing S2200 the secret key from the transmitter to the receiver, wherein the synchronizing step S2100 comprises: a first transmitting step S2120 for transmitting a N-th bit of the clock from the transmitter to the receiver, a second transmitting step S2130 for transmitting acknowledgement of reception of the N-th bit from the receiver to the transmitter, a first checking step S2140 for checking if the N-th bit is a most significant bit of the clock, and an incrementing step S2150 for incrementing the value of N if the first checking step S2140 indicates that the N-th bit is not the most significant bit of the clock.
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公开(公告)号：US11476950B2
公开(公告)日：2022-10-18
申请号：US17390473
申请日：2021-07-30
Inventor： Chen Gong , Jinkang Zhu , Shangbin Li , Rui Ni
IPC: H04B10/00 , H04B10/70 , H04B10/516 , H04J14/00
Abstract: A quantum communication method, an apparatus, and a system are provided. The method includes: modulating a first symbol to an ith direction vector of a first electric wave based on a preset mapping relationship, to obtain a second electric wave; and transmitting the second electric wave, where the first electric wave supports M direction vectors, the ith direction vector of the first electric wave is one of the M direction vectors of the first electric wave, the first symbol is a symbol corresponding to first data, the ith direction vector of the first electric wave corresponds to an ith distribution result, the ith distribution result is obtained by converting the second electric wave into an energy quantum. The first symbol may be modulated to a direction vector of the first electric wave, and this application is compatible with the conventional technology.
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公开(公告)号：US11475348B2
公开(公告)日：2022-10-18
申请号：US16833339
申请日：2020-03-27
Applicant: Google LLC
Inventor： Craig Gidney
IPC: H04B10/00 , G06N10/00 , G11C11/4063 , G06F7/48 , G06F7/72 , G06F7/505 , G06F17/10 , H04B10/70 , H04J14/00
Abstract: Methods and apparatus for piecewise addition into an accumulation register using one or more carry runway registers, where the accumulation register includes a first plurality of qubits with each qubit representing a respective bit of a first binary number and where each carry runway register includes multiple qubits representing a respective binary number. In one aspect, a method includes inserting the one or more carry runway registers into the accumulation register at respective predetermined qubit positions, respectively, of the accumulation register; initializing each qubit of each carry runway register in a plus state; applying one or more subtraction operations to the accumulation register, where each subtraction operation subtracts a state of a respective carry runway register from a corresponding portion of the accumulation register; and adding one or more input binary numbers into the accumulation register using piecewise addition.
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Patent Agency Ranking
公开(公告)号：US20220321234A1
公开(公告)日：2022-10-06
申请号：US17844064
申请日：2022-06-20
Applicant: TSINGHUA UNIVERSITY
Inventor： GUI-LU LONG , LIU-GUO YIN , RUO-YANG QI , HAO-RAN ZHANG
Abstract: Disclosed are an optical path system for quantum communication and a quantum communication method. The optical path system for quantum communication includes a light source module, an intensity and polarization modulation module, a polarization maintaining interference ring, a phase and intensity modulation module, a first isolator, a first polarization beam splitter, a second isolator, a beam splitter, a second polarization beam splitter, a second phase modulator, and a 90-degree Faraday rotator mirror. An optical signal may pass through a first polarization beam splitter, bypass a phase and intensity modulation module, and directly reach a polarization maintaining interference ring, thereby solving a problem of series mode interference in an optical signal circuit, and greatly improving a modulation speed of the circuit.
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公开(公告)号：US20220318365A1
公开(公告)日：2022-10-06
申请号：US17222624
申请日：2021-04-05
Applicant: X Development LLC
Inventor： Cyril Bortolato
Abstract: A photonic device is provided. The photonic device may include an input region and a dispersive region optically coupled with the input region. The dispersive region may include a first material and a second material anisotropically distributed to form a plurality of interfaces that each correspond to a change in a refractive index of the dispersive region. The plurality of interfaces may collectively structure the dispersive region to generate an output optical signal from an input optical signal. The photonic device may also include an output region, optically coupled with the dispersive region. The plurality of interfaces may form a material interface pattern in the dispersive region that is characterized by a defect distribution to introduce one or more spectral artifacts into the output optical signal that collectively define a unique spectral signature of the photonic device.
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公开(公告)号：US20220317544A1
公开(公告)日：2022-10-06
申请号：US17708123
申请日：2022-03-30
Applicant: Michele Reilly
Inventor： Michele Reilly
Abstract: A multiplexed single photon source for quasi-deterministically generating single photons, wherein heralded random single photons generated by pulsed random single photon source are sent through a series of optical switches each having first and second input and output modes and each capable of being switched from a first state corresponding to a SWAP operation to a second state corresponding to an Identity operation on the mode space, whereby the first and second input and output modes of the switches are connected in series to form a first and second optical path respectively, and whereby a first output mode of a last optical switch forms the output mode of the multiplexed single photon source and a second output mode of the last optical switch is connected by a delay loop introducing a time delay Td to the second input mode of a first optical switch. It furthermore relates to a method of quasi-deterministically generating single photons with such a multiplexed single photon source, the method comprising initializing, before or at the start of a first cycle, the first switch in the first state and all subsequent switches in the second state; switching, when the generation of a random single photon is heralded, the first switch to the second state after that photon has been routed onto the closed optical path formed by the second optical path and the delay loop, thereby ensuring that the photon may loop around the closed optical path; and, switching, at the start of the Nth cycle, a last switch of the series of optical switches into the first state, thereby causing the photon to be routed out of the closed optical path and into the output mode of the multiplexed single photon source, such that the photon is output quasi-deterministically at a time N Td after the start of the first cycle.
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公开(公告)号：US11451306B2
公开(公告)日：2022-09-20
申请号：US16875201
申请日：2020-05-15
Inventor： Marcelo Ishihara Davanco
Abstract: A single quantum emitter single photon source produces a single photon stream and includes: a single-mode excitation waveguide that receives a pump light, propagates pump light as resonant excitation light, and produces evanescent excitation light; a separation gap between single-mode excitation waveguide and a multi-mode intermediate waveguide; a multi-mode intermediate waveguide that: includes a single quantum emitter, evanescently receives the evanescent excitation light from the single-mode excitation waveguide, propagates the evanescent excitation light as resonant excitation light, and subjects the single quantum emitter to the resonant excitation light such that the single quantum emitter produces emitted single photons; and a single-mode output waveguide that receives the emitted single photons from the multi-mode intermediate waveguide and propagates the emitted single photons as an emitted single photon stream.
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公开(公告)号：US20220284334A1
公开(公告)日：2022-09-08
申请号：US17746453
申请日：2022-05-17
Applicant: IONQ, INC.
Inventor： Yunseong NAM , Reinhold BLUMEL , Nikodem GRZESIAK
Abstract: A method of performing simultaneous entangling gate operations in a trapped-ion quantum computer includes selecting a gate duration value and a detuning frequency of pulses to be individually applied to a plurality of participating ions in a chain of trapped ions to simultaneously entangle a plurality of pairs of ions among the plurality of participating ions by one or more predetermined values of entanglement interaction, determining amplitudes of the pulses, based on the selected gate duration value, the selected detuning frequency, and the frequencies of the motional modes of the chain of trapped ions, generating the pulses having the determined amplitudes, and applying the generated pulses to the plurality of participating ions for the selected gate duration value. Each of the trapped ions in the chain has two frequency-separated states defining a qubit, and motional modes of the chain of trapped ions each have a distinct frequency.
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