Native two-qubit gates in fixed-coupling, fixed-frequency transmons beyond cross-resonance interaction

• URL: http://arxiv.org/abs/2310.12146v2
• Date: Mon, 20 May 2024 15:49:43 GMT
• Title: Native two-qubit gates in fixed-coupling, fixed-frequency transmons beyond cross-resonance interaction
• Authors: Ken Xuan Wei, Isaac Lauer, Emily Pritchett, William Shanks, David C. McKay, Ali Javadi-Abhari,
• Abstract summary: Cross-resonance gates have been the workhorse of fixed-coupling, fixed-frequency superconducting processors. Here, we use on-resonant and off-resonant microwave drives to go beyond cross-resonance. We show native two-qubit gates are better than their counterparts compiled from cross-resonance gates.
• Score: 1.0797934175846036
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Fixed-frequency superconducting qubits demonstrate remarkable success as platforms for stable and scalable quantum computing. Cross-resonance gates have been the workhorse of fixed-coupling, fixed-frequency superconducting processors, leveraging the entanglement generated by driving one qubit resonantly with a neighbor's frequency to achieve high-fidelity, universal CNOTs. Here, we use on-resonant and off-resonant microwave drives to go beyond cross-resonance, realizing natively interesting two-qubit gates that are not equivalent to CNOTs. In particular, we implement and benchmark native ISWAP, SWAP, $\sqrt{\text{ISWAP}}$, and BSWAP gates. Furthermore, we apply these techniques for an efficient construction of the B-gate: a perfect entangler from which any two-qubit gate can be reached in only two applications. We show these native two-qubit gates are better than their counterparts compiled from cross-resonance gates. We elucidate the resonance conditions required to drive each two-qubit gate and provide a novel frame tracking technique to implement them in Qiskit.

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