Patents by Inventor Steven M. Girvin

Steven M. Girvin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240303520
    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-turn 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.
    Type: Application
    Filed: January 31, 2022
    Publication date: September 12, 2024
    Applicants: The University of Chicago, Yale University
    Inventors: Chiao-Hsuan Wang, Kyungjoo Noh, José Lebreuilly, Steven M. Girvin, Liang Jiang
  • Patent number: 11909451
    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.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: February 20, 2024
    Assignee: Yale University
    Inventors: Kyungjoo Noh, Steven M. Girvin, Liang Jiang
  • Patent number: 11791818
    Abstract: Parametrically pumped four-wave mixing is a key building block for many developments in the field of superconducting quantum information processing. However, undesired frequency shifts such as Kerr, cross-Ken and Stark shifts inherent with four-wave mixing, lead to difficulties in tuning up the desired parametric processes and, for certain applications, severely limit the fidelities of the resulting operations. Some embodiments include a Josephson four-wave mixing device consisting of a SQUID transmon coupled to a half-flux biased SNAIL transmon, a.k.a. capacitively shunted flux qubit. When the two transmon have matching frequencies, an interference effect cancels the negative Kerr of the SQUID transmon with the positive Kerr of the SNAIL transmon while preserving parametric four-wave mixing capabilities.
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: October 17, 2023
    Assignee: Yale University
    Inventors: Shantanu Mundhada, Nicholas Frattini, Shruti Puri, Shyam Shankar, Steven M. Girvin, Michel Devoret
  • Patent number: 11449384
    Abstract: Techniques for providing hardware-efficient fault-tolerant quantum operations are provided. In some aspects a cavity and an ancilla transmon are used to implement a quantum operation by encoding a logical qubit using more than two energy levels of the cavity, encoding information using more than two energy levels of the ancilla transmon, and creating an interaction between the cavity and the ancilla transmon that decouples at least one error type in the ancilla transmon from the cavity.
    Type: Grant
    Filed: January 5, 2019
    Date of Patent: September 20, 2022
    Assignee: Yale University
    Inventors: Serge Rosenblum, Philip Reinhold, Liang Jiang, Steven M. Girvin, Luigi Frunzio, Michel Devoret, Robert J. Schoelkopf, III
  • Patent number: 11451231
    Abstract: Techniques for implementing robust quantum logic gates are provided and described. In some aspects, a quantum logic gate between a plurality of cavities comprising a first cavity and a second cavity is implemented by performing a first beam splitter operation between the first cavity and the second cavity using a coupling transmon that is dispersively coupled to both the first cavity and the second cavity, and performing a controlled phase shift operation between the second cavity and an ancilla transmon that is dispersively coupled to the second cavity but not dispersively coupled to the first cavity.
    Type: Grant
    Filed: January 5, 2019
    Date of Patent: September 20, 2022
    Assignee: Yale University
    Inventors: Liang Jiang, Steven M. Girvin, Brian Lester, Yvonne Gao, Robert J. Schoelkopf, III
  • Publication number: 20220190933
    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.
    Type: Application
    Filed: March 27, 2020
    Publication date: June 16, 2022
    Applicant: Yale University
    Inventors: Kyungjoo Noh, Steven M. Girvin, Liang Jiang
  • Publication number: 20220147266
    Abstract: Techniques for implementing a QRAM by routing quantum information through multiple modes of a bosonic system are described. According to some aspects, a single bosonic system may be configured to maintain quantum information in a large number of independent modes at the same time. Suitable operations upon these modes may allow a quantum address value to be routed to modes associated with respective bits such that the only modes altered by the operations are those associated with the addresses being accessed. These modes may be operated upon based on the stored values then extracted to obtain the desired correlated superposition of the stored bit values in the addresses. The bits stored at the address locations may be classical bits, or may be qubits.
    Type: Application
    Filed: February 28, 2020
    Publication date: May 12, 2022
    Applicant: Yale University
    Inventors: Connor Hann, Changling Zou, Yiwen Chu, Yaxing Zhang, Robert J. Schoelkopf III, Steven M. Girvin, Liang Jiang
  • Publication number: 20220103172
    Abstract: Parametrically pumped four-wave mixing is a key building block for many developments in the field of superconducting quantum information processing. However, undesired frequency shifts such as Kerr, cross-Ken and Stark shifts inherent with four-wave mixing, lead to difficulties in tuning up the desired parametric processes and, for certain applications, severely limit the fidelities of the resulting operations. Some embodiments include a Josephson four-wave mixing device consisting of a SQUID transmon coupled to a half-flux biased SNAIL transmon, a.k.a. capacitively shunted flux qubit. When the two transmon have matching frequencies, an interference effect cancels the negative Kerr of the SQUID transmon with the positive Kerr of the SNAIL transmon while preserving parametric four-wave mixing capabilities.
    Type: Application
    Filed: January 15, 2020
    Publication date: March 31, 2022
    Applicant: Yale University
    Inventors: Shantanu Mundhada, Nicholas Frattini, Shruti Puri, Shyam Shankar, Steven M. Girvin, Michel Devoret
  • Publication number: 20210390444
    Abstract: Techniques for performing quantum information processing using an asymmetric error channel are provided. According to some aspects, a quantum information processing includes a data qubit and an ancilla qubit, the ancilla qubit having an asymmetric error channel. The data qubit is coupled to the ancilla qubit. The ancilla qubit may be driven with a stabilizing microwave field to create the asymmetric error channel.
    Type: Application
    Filed: June 28, 2019
    Publication date: December 16, 2021
    Applicant: Yale University
    Inventors: Shruti Puri, Alexander Grimm, Philippe Campagne-lbarcq, Steven M. Girvin, Michel Devoret
  • Patent number: 11037068
    Abstract: Some aspects are directed to a method of operating a circuit quantum electrodynamics system that includes a physical qubit dispersively coupled to a quantum mechanical oscillator, the method comprising measuring a parity of a first state of the quantum mechanical oscillator, subsequent to measuring the parity of the first state, measuring a parity of a second state of the quantum mechanical oscillator, the second state being different from the first state, applying a first drive waveform to the quantum mechanical oscillator, and applying a second drive waveform to the physical qubit concurrent with the application of the first drive waveform, wherein the first drive waveform and the second drive waveform are selected based at least in part on a result of comparing the measured parity of the second state to the measured parity of the first state.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: June 15, 2021
    Assignee: Yale University
    Inventors: Steven M. Girvin, Liang Jiang, Marios H. Michael, Matti Silveri, Richard T. Brierley, Victor V. Albert, Juha Salmilehto
  • Publication number: 20210125096
    Abstract: Techniques for performing quantum information processing using an asymmetric error channel are provided. According to some aspects, a quantum information processing includes a data qubit and an ancilla qubit, the ancilla qubit having an asymmetric error channel. The data qubit is coupled to the ancilla qubit. The ancilla qubit may be driven with a stabilizing microwave field to create the asymmetric error channel.
    Type: Application
    Filed: June 28, 2019
    Publication date: April 29, 2021
    Applicant: Yale University
    Inventors: Shruti Puri, Alexander Grimm, Philippe Campagne-lbarcq, Steven M. Girvin, Michel Devoret
  • Publication number: 20200412369
    Abstract: Techniques for implementing robust quantum logic gates are provided and described. In some aspects, a quantum logic gate between a plurality of cavities comprising a first cavity and a second cavity is implemented by performing a first beam splitter operation between the first cavity and the second cavity using a coupling transmon that is dispersively coupled to both the first cavity and the second cavity, and performing a controlled phase shift operation between the second cavity and an ancilla transmon that is dispersively coupled to the second cavity but not dispersively coupled to the first cavity.
    Type: Application
    Filed: January 5, 2019
    Publication date: December 31, 2020
    Applicant: Yale University
    Inventors: Liang Jiang, Steven M. Girvin, Brian Lester, Yvonne Gao, Robert J. Schoelkopf lll
  • Publication number: 20200334104
    Abstract: Techniques for providing hardware-efficient fault-tolerant quantum operations are provided. In some aspects a cavity and an ancilla transmon are used to implement a quantum operation by encoding a logical qubit using more than two energy levels of the cavity, encoding information using more than two energy levels of the ancilla transmon, and creating an interaction between the cavity and the ancilla transmon that decouples at least one error type in the ancilla transmon from the cavity.
    Type: Application
    Filed: January 5, 2019
    Publication date: October 22, 2020
    Applicant: Yale University
    Inventors: Serge Rosenblum, Philip Reinhold, Liang Jiang, Steven M. Girvin, Luigi Frunzio, Michel Devoret, Robert J. Schoelkopf III
  • Patent number: 10776709
    Abstract: According to some aspects, a quantum information system is provided that includes an ancilla qubit; a qudit coupled to the ancilla qubit, a detector configured to generate a detection result based on a quantum state of the ancilla qubit, and a driving source coupled to the qudit and the ancilla qubit and configured to apply at least one qudit driving signal to the qudit based on the detection result and at least one qubit driving signal to the qudit based on the detection result.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: September 15, 2020
    Assignee: Yale University
    Inventors: Chao Shen, Kyungjoo Noh, Victor V. Albert, Stefan Krastanov, Michel Devoret, Robert J. Schoelkopf, III, Steven M. Girvin, Liang Jiang
  • Publication number: 20200242500
    Abstract: Some aspects are directed to a method of operating a circuit quantum electrodynamics system that includes a physical qubit dispersively coupled to a quantum mechanical oscillator, the method comprising measuring a parity of a first state of the quantum mechanical oscillator, subsequent to measuring the parity of the first state, measuring a parity of a second state of the quantum mechanical oscillator, the second state being different from the first state, applying a first drive waveform to the quantum mechanical oscillator, and applying a second drive waveform to the physical qubit concurrent with the application of the first drive waveform, wherein the first drive waveform and the second drive waveform are selected based at least in part on a result of comparing the measured parity of the second state to the measured parity of the first state.
    Type: Application
    Filed: December 2, 2016
    Publication date: July 30, 2020
    Applicant: Yale University
    Inventors: Steven M. Girvin, Liang Jiang, Marios H. Michael, Matti Silveri, Richard T. Brierley, Victor V. Albert, Juha Salmilehto
  • Publication number: 20190266512
    Abstract: According to some aspects, a quantum information system is provided that includes an ancilla qubit; a qudit coupled to the ancilla qubit, a detector configured to generate a detection result based on a quantum state of the ancilla qubit, and a driving source coupled to the qudit and the ancilla qubit and configured to apply at least one qudit driving signal to the qudit based on the detection result and at least one qubit driving signal to the qudit based on the detection result.
    Type: Application
    Filed: November 10, 2017
    Publication date: August 29, 2019
    Applicant: Yale University
    Inventors: Chao Shen, Kyungjoo Noh, Victor V. Albert, Stefan Krastanov, Michel Devoret, Robert J. Schoelkopf, Steven M. Girvin, Liang Jiang