公开(公告)号：US11715026B2

公开(公告)日：2023-08-01

申请号：US16917710

申请日：2020-06-30

Applicant: Massachusetts Institute of Technology

Inventor： William Oliver ,  Seth Lloyd ,  Danna Rosenberg ,  Michael O'Keeffe ,  Amy Greene ,  Morten Kjaergaard ,  Mollie Schwartz ,  Gabriel Samach ,  Iman Marvian Mashhad

IPC: G06N10/00 ,  G06F11/00 ,  H03M13/00 ,  H10N60/84

CPC classification number: G06N10/00 ,  G06F11/004 ,  H03M13/6508 ,  H10N60/84

Abstract: Systems and methods for performing open-loop quantum error mitigation using quantum measurement emulations are provided. The open-loop quantum error mitigation methods do not require the performance of state readouts or state tomography, reducing hardware requirements and increasing overall computation speed. To perform a quantum measurement emulation, an error mitigation apparatus is configured to stochastically apply a quantum gate to a qubit or set of qubits during a quantum computational process. The stochastic application of the quantum gate projects the quantum state of the affected qubits onto an axis, reducing a trace distance between the quantum state and a desired quantum state.

公开(公告)号：US10126506B2

公开(公告)日：2018-11-13

申请号：US15486088

申请日：2017-04-12

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Jacob C. Mower ,  Jelena Notaros ,  Mikkel Heuck ,  Dirk Robert Englund ,  Cosmo Lupo ,  Seth Lloyd

IPC: H04B10/40 ,  G02B6/293 ,  G02F1/225 ,  G02F1/21

Abstract: A large-scale tunable-coupling ring array includes an input waveguide coupled to multiple ring resonators, each of which has a distinct resonant wavelength. The collective effect of these multiple ring resonators is to impart a distinct time delay to a distinct wavelength component (or frequency component) in an input signal, thereby carrying out quantum scrambling of the input signal. The scrambled signal is received by a receiver also using a large-scale tunable-coupling ring array. This receiver-end ring resonator array recovers the input signal by imparting a compensatory time delay to each wavelength component. Each ring resonator can be coupled to the input waveguide via a corresponding Mach Zehnder interferometer (MZI). The MZI includes a phase shifter on at least one of its arms to increase the tunability of the ring array.

公开(公告)号：US20210406749A1

公开(公告)日：2021-12-30

申请号：US16917710

申请日：2020-06-30

Applicant: Massachusetts Institute of Technology

Inventor： William Oliver ,  Seth Lloyd ,  Danna Rosenberg ,  Michael O'Keeffe ,  Amy Greene ,  Morten Kjaergaard ,  Mollie Schwartz ,  Gabriel Samach ,  Iman Marvian Mashhad

IPC: G06N10/00 ,  H03M13/00 ,  H01L39/10 ,  G06F11/00

Abstract: Systems and methods for performing open-loop quantum error mitigation using quantum measurement emulations are provided. The open-loop quantum error mitigation methods do not require the performance of state readouts or state tomography, reducing hardware requirements and increasing overall computation speed. To perform a quantum measurement emulation, an error mitigation apparatus is configured to stochastically apply a quantum gate to a qubit or set of qubits during a quantum computational process. The stochastic application of the quantum gate projects the quantum state of the affected qubits onto an axis, reducing a trace distance between the quantum state and a desired quantum state.