Native two-qubit gates in fixed-coupling, fixed-frequency transmons beyond cross-resonance interaction
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909207250337792 |
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| author | Wei, Ken Xuan Lauer, Isaac Pritchett, Emily Shanks, William McKay, David C. Javadi-Abhari, Ali |
| author_facet | Wei, Ken Xuan Lauer, Isaac Pritchett, Emily Shanks, William McKay, David C. Javadi-Abhari, Ali |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_12146 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Native two-qubit gates in fixed-coupling, fixed-frequency transmons beyond cross-resonance interaction Wei, Ken Xuan Lauer, Isaac Pritchett, Emily Shanks, William McKay, David C. Javadi-Abhari, Ali Quantum Physics 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. |
| title | Native two-qubit gates in fixed-coupling, fixed-frequency transmons beyond cross-resonance interaction |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2310.12146 |