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).
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Publication number: 20240303520Abstract: 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: ApplicationFiled: January 31, 2022Publication date: September 12, 2024Applicants: The University of Chicago, Yale UniversityInventors: Chiao-Hsuan Wang, Kyungjoo Noh, José Lebreuilly, Steven M. Girvin, Liang Jiang
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Patent number: 11909451Abstract: 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: GrantFiled: March 27, 2020Date of Patent: February 20, 2024Assignee: Yale UniversityInventors: Kyungjoo Noh, Steven M. Girvin, Liang Jiang
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Patent number: 11791818Abstract: 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: GrantFiled: January 15, 2020Date of Patent: October 17, 2023Assignee: Yale UniversityInventors: Shantanu Mundhada, Nicholas Frattini, Shruti Puri, Shyam Shankar, Steven M. Girvin, Michel Devoret
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Patent number: 11449384Abstract: 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: GrantFiled: January 5, 2019Date of Patent: September 20, 2022Assignee: Yale UniversityInventors: Serge Rosenblum, Philip Reinhold, Liang Jiang, Steven M. Girvin, Luigi Frunzio, Michel Devoret, Robert J. Schoelkopf, III
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Patent number: 11451231Abstract: 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: GrantFiled: January 5, 2019Date of Patent: September 20, 2022Assignee: Yale UniversityInventors: Liang Jiang, Steven M. Girvin, Brian Lester, Yvonne Gao, Robert J. Schoelkopf, III
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Publication number: 20220190933Abstract: 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: ApplicationFiled: March 27, 2020Publication date: June 16, 2022Applicant: Yale UniversityInventors: Kyungjoo Noh, Steven M. Girvin, Liang Jiang
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Publication number: 20220147266Abstract: 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: ApplicationFiled: February 28, 2020Publication date: May 12, 2022Applicant: Yale UniversityInventors: Connor Hann, Changling Zou, Yiwen Chu, Yaxing Zhang, Robert J. Schoelkopf III, Steven M. Girvin, Liang Jiang
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Publication number: 20220103172Abstract: 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: ApplicationFiled: January 15, 2020Publication date: March 31, 2022Applicant: Yale UniversityInventors: Shantanu Mundhada, Nicholas Frattini, Shruti Puri, Shyam Shankar, Steven M. Girvin, Michel Devoret
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Publication number: 20210390444Abstract: 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: ApplicationFiled: June 28, 2019Publication date: December 16, 2021Applicant: Yale UniversityInventors: Shruti Puri, Alexander Grimm, Philippe Campagne-lbarcq, Steven M. Girvin, Michel Devoret
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Patent number: 11037068Abstract: 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: GrantFiled: December 2, 2016Date of Patent: June 15, 2021Assignee: Yale UniversityInventors: Steven M. Girvin, Liang Jiang, Marios H. Michael, Matti Silveri, Richard T. Brierley, Victor V. Albert, Juha Salmilehto
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Publication number: 20210125096Abstract: 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: ApplicationFiled: June 28, 2019Publication date: April 29, 2021Applicant: Yale UniversityInventors: Shruti Puri, Alexander Grimm, Philippe Campagne-lbarcq, Steven M. Girvin, Michel Devoret
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Publication number: 20200412369Abstract: 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: ApplicationFiled: January 5, 2019Publication date: December 31, 2020Applicant: Yale UniversityInventors: Liang Jiang, Steven M. Girvin, Brian Lester, Yvonne Gao, Robert J. Schoelkopf lll
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Publication number: 20200334104Abstract: 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: ApplicationFiled: January 5, 2019Publication date: October 22, 2020Applicant: Yale UniversityInventors: Serge Rosenblum, Philip Reinhold, Liang Jiang, Steven M. Girvin, Luigi Frunzio, Michel Devoret, Robert J. Schoelkopf III
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Patent number: 10776709Abstract: 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: GrantFiled: November 10, 2017Date of Patent: September 15, 2020Assignee: Yale UniversityInventors: Chao Shen, Kyungjoo Noh, Victor V. Albert, Stefan Krastanov, Michel Devoret, Robert J. Schoelkopf, III, Steven M. Girvin, Liang Jiang
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Publication number: 20200242500Abstract: 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: ApplicationFiled: December 2, 2016Publication date: July 30, 2020Applicant: Yale UniversityInventors: Steven M. Girvin, Liang Jiang, Marios H. Michael, Matti Silveri, Richard T. Brierley, Victor V. Albert, Juha Salmilehto
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Publication number: 20190266512Abstract: 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: ApplicationFiled: November 10, 2017Publication date: August 29, 2019Applicant: Yale UniversityInventors: Chao Shen, Kyungjoo Noh, Victor V. Albert, Stefan Krastanov, Michel Devoret, Robert J. Schoelkopf, Steven M. Girvin, Liang Jiang