公开(公告)号：US20230194634A1

公开(公告)日：2023-06-22

申请号：US18057807

申请日：2022-11-22

Applicant: The University of Chicago

Inventor： Aashish Clerk ,  Martin Koppenhöfer ,  Peter Groszkowski

IPC: G01R33/00 ,  G01R33/12

CPC classification number: G01R33/0029 ,  G01R33/1284

Abstract: A method for quantum spin amplification includes spin-polarizing an ensemble of quantum spins in an initial spin state to generate a transversely-polarized sensing spin state. The quantum spins identically have an upper energy state and a lower energy state. The sensing spin state accumulates a phase shift that transforms the sensing spin state into a phase-accumulated spin state having first and second transverse polarization components. The phase-accumulated spin state is transformed into an intermediate spin state by rotating the first transverse polarization component into a longitudinal polarization component of the intermediate spin state. The ensemble is then coupled to an auxiliary mode, during which the intermediate spin state evolves such that the second transverse polarization component is amplified into an amplified transverse polarization. This amplified transverse polarization is then measured.

公开(公告)号：US20230267361A1

公开(公告)日：2023-08-24

申请号：US18161569

申请日：2023-01-30

Applicant: The University of Chicago

Inventor： Aashish Clerk ,  Andrew Lingenfelter

IPC: G06N10/40

CPC classification number: G06N10/40

Abstract: A method and system that harnesses extremely weak Kerr-type nonlinearities in a single driven cavity to deterministically generate single photon Fock states, and more general photon-blockaded states are disclosed. The disclosed scheme is effective even for nonlinearities that are much smaller than photonic loss in the cavity. The disclosed scheme generates photon-blockade states that are non-Gaussian, exhibit a sharp cut-off in their photon number distribution, and can be arbitrarily close to, for example, a single-photon Fock state. This scheme relies only standard linear and parametric drives, and are hence compatible with a variety of different photonic platforms.

公开(公告)号：US20230020178A1

公开(公告)日：2023-01-19

申请号：US17756481

申请日：2020-12-13

Applicant: The University of Chicago

Inventor： Aashish Clerk ,  Alexander McDonald

IPC: H03F7/04 ,  H03F3/189 ,  H03F19/00

Abstract: Optimally detuned parametric amplification amplifies a signal in a resonator that is driven off-resonance, with respect to a signal mode, using a far-detuned pump. This pump establishes a parametric drive strength, and is “far-detuned” in that its detuning from the signal mode is greater than the drive strength. The amplitude and frequency of the pump are chosen so that the eigenfrequency of the resulting Bogoliobov mode matches a photonic loss rate of the Bogoliobov mode. In this case, a signal coupled into the Bogoliobov mode will be amplified with a gain that is broader and flatter than that achieved with conventional parametric amplification, and is not limited by a gain-bandwidth product. Optimally detuned parametric amplification may be used for degenerate or non-degenerate parametric amplification, and may be used to amplify microwaves, light, electronic signals, acoustic waves, or any other type of signal that can be amplified using conventional parametric amplification.

公开(公告)号：US11174162B2

公开(公告)日：2021-11-16

申请号：US17056599

申请日：2019-05-30

Applicant: THE UNIVERSITY OF CHICAGO

Inventor： Aashish Clerk ,  Hoi-Kwan Lau

IPC: B82Y15/00 ,  H01P1/38 ,  H01P7/06

Abstract: Technologies for quantum sensing are disclosed. In the illustrative embodiment, a sensor system may be operated by coupling an electromagnetic wave from a measurement line to a first resonator. The sensor system includes a second resonator that is non-reciprocally coupled to the first resonator. In the absence or a perturbation, there is no reciprocal coupling between the first resonator and the second resonator, but a perturbation may cause reciprocal coupling between the first and second resonator. With appropriate selection of the non-reciprocal coupling, the signal at the output of the measurement line may allow for fast determination of whether the perturbation is present.

公开(公告)号：US11671063B2

公开(公告)日：2023-06-06

申请号：US17756481

申请日：2020-12-13

Applicant: The University of Chicago

Inventor： Aashish Clerk ,  Alexander McDonald

IPC: H03F7/04 ,  H03F19/00 ,  G02F1/31 ,  G02F1/39 ,  H03F3/189

CPC classification number: H03F7/04 ,  G02F1/31 ,  G02F1/392 ,  H03F3/189 ,  H03F19/00

Abstract: Optimally detuned parametric amplification amplifies a signal in a resonator that is driven off-resonance, with respect to a signal mode, using a far-detuned pump. This pump establishes a parametric drive strength, and is “far-detuned” in that its detuning from the signal mode is greater than the drive strength. The amplitude and frequency of the pump are chosen so that the eigenfrequency of the resulting Bogoliobov mode matches a photonic loss rate of the Bogoliobov mode. In this case, a signal coupled into the Bogoliobov mode will be amplified with a gain that is broader and flatter than that achieved with conventional parametric amplification, and is not limited by a gain-bandwidth product. Optimally detuned parametric amplification may be used for degenerate or non-degenerate parametric amplification, and may be used to amplify microwaves, light, electronic signals, acoustic waves, or any other type of signal that can be amplified using conventional parametric amplification.