SYSTEMS, DEVICES, AND METHODS FOR CONTROLLABLY COUPLING QUBITS
First Claim
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1. A coupling system comprising:
- an rf SQUID having a loop of superconducting material interrupted by a compound Josephson junction;
a first magnetic flux inductor inductively coupled to the compound Josephson junction and capable of controlling a β
L parameter of the coupling system;
a second magnetic flux inductor inductively coupled to the loop of superconducting material;
a first coupling structure coupling the rf SQUID to a first qubit; and
a second coupling structure coupling the rf SQUID to a second qubit; and
wherein the coupling system is operated such that the β
L parameter is greater than 1.
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Abstract
A coupling system may include first and second magnetic flux inductors communicatively coupled to a Josephson junction of an rf SQUID. The coupling system may allow transverse coupling between qubits. A superconducting processor may include at least one of the coupling systems and two or more qubits. A method may include providing first, second and third coupling structure to control the coupling system.
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Citations
27 Claims
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1. A coupling system comprising:
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an rf SQUID having a loop of superconducting material interrupted by a compound Josephson junction; a first magnetic flux inductor inductively coupled to the compound Josephson junction and capable of controlling a β
L parameter of the coupling system;a second magnetic flux inductor inductively coupled to the loop of superconducting material; a first coupling structure coupling the rf SQUID to a first qubit; and a second coupling structure coupling the rf SQUID to a second qubit; and wherein the coupling system is operated such that the β
L parameter is greater than 1. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controllably coupling a first qubit to a second qubit using an rf SQUID having a loop of superconducting material interrupted by a compound Josephson junction, the method comprising:
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coupling the first qubit to the rf SQUID; coupling the second qubit to the rf SQUID; coupling a first magnetic flux inductor to the compound Josephson junction; coupling a second magnetic flux inductor to the loop or superconducting material; adjusting a first amount of flux, produced by the first magnetic flux inductor, threading the compound Josephson junction; and adjusting a second amount of flux, produced by the second magnetic flux inductor, that threads the loop of superconducting material such that the first qubit is transversely coupled to the second qubit. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A coupling system comprising:
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an rf SQUID having a loop of superconducting material interrupted by a compound Josephson junction and a β
L parameter;a first magnetic flux inductor configured to selectively provide a first magnetic flux inductor mutual inductance coupling the first magnetic flux inductor to the compound Josephson junction, wherein the first magnetic flux inductor adjusts the β
L parameter to be greater than one; anda second magnetic flux inductor configured to selectively provide a second magnetic flux inductor mutual inductance coupling the second magnetic flux inductor to the loop or superconducting material, wherein the loop of superconducting material is positioned with respect to a first qubit to provide a first mutual inductance coupling the rf SQUID to the first qubit, and wherein the loop of superconducting material is positioned with respect to a second qubit to provide a second mutual inductance coupling rf SQUID to the second qubit.
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16. A superconducting processor comprising:
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a first qubit; a second qubit; an rf SQUID having a loop of superconducting material interrupted by a compound Josephson junction and a β
L parameter;a first magnetic flux means for selectively providing inductance coupling the first magnetic flux means to the compound Josephson junction, wherein the first magnetic flux means adjusts the β
L parameter to be greater than one; anda second magnetic flux means for selectively providing inductance coupling the second magnetic flux means to the loop of superconducting material, wherein the loop of superconducting material is configured to provide a first mutual inductance coupling the rf SQUID to the first qubit and to provide a second mutual inductance coupling the rf SQUID to the second qubit. - View Dependent Claims (17, 18, 19)
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20. A method of controllably coupling a first qubit to a second qubit using an rf SQUID having a loop of superconducting material interrupted by a compound Josephson junction and a β
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L parameter, the method comprising;
coupling the first qubit to the rf SQUID; coupling the second qubit to the rf SQUID; coupling a first magnetic flux inductor to the compound Josephson junction; coupling a second magnetic flux inductor to the loop or superconducting material; adjusting a first amount of flux, produced by the second magnetic flux inductor, threading the compound Josephson junction, wherein the first amount of flux adjusts the β
L parameter to be greater than one; andadjusting a second amount of flux, produced by the second magnetic flux inductor, threading the loop of superconducting material. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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L parameter, the method comprising;
Specification