Arbitrary controlled-phase gate on fluxonium qubits
ORAL
Abstract
Recent achievements in quantum computing underlined the need of continuous families of two-qubit gates specially tailored for certain class of algorithms currently used on Noisy Intermediate Scale Quantum (NISQ) processors. In this work, we demonstrate the implementation of a continuous set of microwave-activated arbitrary controlled-phase (CPhase) gates on two fluxonium qubits, a promising candidate for quantum computation. We realized fast (110 ns) and precise (99.1% fidelity) CPhase gates by driving off-resonantly higher transitions. We assess the quality of our gates by performing quantum process tomography, interleaved randomized benchmarking and cross-entropy benchmarking. Additionally, we demonstrate that this technique can be used to cancel static ZZ interaction to mitigate quantum cross-talks between qubits. Unlike the equivalent gate on the transmon qubit, our scheme does not require any auxiliary degree of freedom nor parameter matching relieving the burden to scaling this approach to larger systems. We conclude the dominant error source is due to incoherent processes that could be mitigated to reduce errors in the 10^-3 range.
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Presenters
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Haonan Xiong
- University of Maryland, College Park