Managing coupling in a quantum computing system
AssigneeGoogle Inc.
InventorsBharath Kannan, Youngkyu Sung, Leon Chen Ding
Life of this patent
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Abstract
An apparatus comprises: an array of coupled quantum elements in a housing configured to provide a low-temperature environment, where at least one of the quantum elements comprises: a first fluxonium qubit circuit, and a qubit coupling circuit configured to couple the first fluxonium qubit circuit to a second fluxonium qubit circuit, where the qubit coupling circuit comprises a tunable superconducting circuit that has at least one tunable characteristic; and a control module configured to apply magnetic flux pulses to quantum elements in the array of coupled quantum elements based at least in part on digital control signals received from a digital signal interface providing the digital control signals into the housing.
Claims47
A method for performing at least one quantum gate operation on a quantum processor, the method comprising:
- applying a first magnetic field flux pulse through a first inductive loop associated with a first superconducting circuit;
- and
- where, during a portion of the first magnetic field flux pulse, a first energy associated with a first multi-qubit state comprising an excited state of the first superconducting circuit and a state of a second superconducting circuit is substantially equal to a second energy associated with a second multi-qubit state comprising a ground state of the first superconducting circuit and an excited state of the second superconducting circuit.
The method of 6, wherein applying at least one of the first magnetic field flux pulse or the second magnetic field flux pulse applies a quantum gate operation that transfers quantum state population between the first multi-qubit state and the second multi-qubit state.
An apparatus comprising:
- an array of coupled quantum elements comprising
- a first superconducting circuit, and
- a second superconducting circuit;
- and
- a control module configured to apply magnetic flux pulses to quantum elements in the array of coupled quantum elements, the magnetic flux pulses comprising a first magnetic flux pulse;
- where, during a portion of the first magnetic field flux pulse, a first energy associated with a first multi-qubit state comprising an excited state of the first superconducting circuit and a state of a second superconducting circuit is substantially equal to a second energy associated with a second multi-qubit state comprising a ground state of the first superconducting circuit and an excited state of the second superconducting circuit.
Dependencies are inferred from the claim text.