MULTI-QUBIT TUNABLE COUPLING ARCHITECTURE USING FIXED-FREQUENCY SUPERCONDUCTING QUBITS
First Claim
1. A coupling mechanism comprising:
- two qubits; and
a tunable coupling qubit that activates an interaction between the two qubits by modulation of a frequency of the tunable coupling qubit.
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Abstract
Various embodiments provide a coupling mechanism, method of activation and a square lattice. The coupling mechanism comprises two qubits and a tunable coupling qubit that activates an interaction between the two qubits by modulation of a frequency of the tunable coupling qubit. The tunable coupling qubit capacitively couples the two qubits. The tunable coupling qubit is modulated at a difference frequency of the two qubits. The difference frequency may be significantly larger than an anharmonicity of the two qubits. The tunable coupling qubit may be coupled to the two qubits by two electrodes separated by a superconducting quantum interference device (SQUID) loop having two Josephson junctions or by a single electrode with a SQUID loop coupling to ground. The SQUID loop is controlled by an inductively-coupled flux bias line positioned at the center of the tunable coupling qubit.
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Citations
25 Claims
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1. A coupling mechanism comprising:
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two qubits; and a tunable coupling qubit that activates an interaction between the two qubits by modulation of a frequency of the tunable coupling qubit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of activating a coupling mechanism comprising:
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positioning a tunable coupling qubit between two qubits; and modulating a frequency of the tunable coupling qubit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A square lattice comprising:
a plurality of unit cells, each unit cell comprising; two or more qubits; and a tunable coupling qubit that activates an interaction between a pair of qubits of the two or more qubits by modulation of a frequency of the tunable coupling qubit.
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25. A quantum gate comprising:
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two superconducting qubits; and a tunable coupling qubit that activates an interaction between the two superconducting qubits by modulation of a frequency of the tunable coupling qubit.
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Specification