公开(公告)号：WO2022165364A1

公开(公告)日：2022-08-04

申请号：PCT/US2022/014603

申请日：2022-01-31

Applicant: UNIVERSITY OF CHICAGO ,  YALE UNIVERSITY

Inventor： WANG, Chiao-Hsuan ,  NOH, Kyungjoo ,  LEBREUILLY, José ,  GIRVIN, Steven, M. ,  JIANG, Liang

IPC: G06F17/18 ,  G06N10/70 ,  G11C11/44 ,  H01L39/22 ,  H01P7/06 ,  H04B10/70

Abstract: Cavity resonators are promising resources for quantum technology, while native nonlinear interactions for cavities are typically too weak to provide the level of quan¬ tum control required to deliver complex targeted operations. Here we investigate a scheme to engineer a target Hamiltonian for photonic cavities using ancilla qubits. By off-resonantly driving dispersively coupled ancilla qubits, we develop an optimized approach to engineering an arbitrary photon-number dependent (PND) Hamiltonian for the cavities while minimizing the operation errors. The engineered Hamiltonian admits various applications including canceling unwanted cavity self-Kerr interac¬ tions, creating higher-order nonlinearities for quantum simulations, and designing quantum gates resilient to noise. Our scheme can be implemented with coupled microwave cavities and transmon qubits in superconducting circuit systems.

公开(公告)号：WO2022039818A2

公开(公告)日：2022-02-24

申请号：PCT/US2021/035940

申请日：2021-06-04

Applicant: THE UNIVERSITY OF CHICAGO

Inventor： JIANG, Liang ,  ROZPEDEK, Filip D. ,  NOH, Kyungjoo

IPC: G06N10/70 ,  G06N10/20 ,  G06N10/40 ,  G06F11/07

Abstract: Quantum repeaters and network architectures use two concatenated quantum error correction codes to increase the transmission range of quantum information. A block of data qubits collectively encode a second-layer logical qubit according to a second-layer code concatenated with a first-layer code. A first-layer quantum repeater first-layer corrects each data qubit based on a first-layer syndrome extracted therefrom. The first-layer quantum repeater transmits these first-layer-corrected qubits to a second-layer quantum repeater via a quantum communication channel. The first-layer quantum repeater also transmits the first-layer syndromes to the second-layer quantum repeater via a classical communication channel. After extracting a second-layer syndrome from the first-layer-corrected qubits, the second-layer quantum repeater uses the first-layer syndromes and second-layer syndrome to second-layer correct the first-layer-corrected qubits. The first-layer syndromes improve quantum error correction by reducing the number of second-layer stabilizer measurements needed to determine which data qubits have an error.

公开(公告)号：WO2020198581A1

公开(公告)日：2020-10-01

申请号：PCT/US2020/025204

申请日：2020-03-27

Applicant: YALE UNIVERSITY

Inventor： NOH, Kyungjoo ,  GIRVIN, Steven, M. ,  JIANG, Liang

IPC: G06F11/07 ,  G06F11/08 ,  G06F11/10 ,  H01L39/22 ,  H01L39/24 ,  H04B10/70

Abstract: Systems and methods for performing bosonic quantum error correction (QEC) using Gottesman-Kitaev-Preskill (GKP) states are provided. An ancilla quantum mechanical oscillator is used to probe Gaussian noise experienced by a data quantum mechanical oscillator without disturbing the state of the data quantum mechanical oscillator. The ancilla quantum mechanical oscillator is initialized with a GKP state and entangled with the state of a data quantum mechanical oscillator to correlate any noise experienced by the data state with the state of the ancilla quantum mechanical oscillator. The states are then disentangled, and momentum and position quadrature operators of the ancilla quantum mechanical oscillator are measured and used to perform QEC on the information stored in the data quantum mechanical oscillator.