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Three-mode tunable coupler for superconducting two-qubit gates
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Building a scalable universal high-performance quantum processor is a formidable challenge. In particular, the problem of realizing fast high-perfomance two-qubit gates of high-fidelity remains needful. Here we propose a building block for a scalable quantum processor consisting of two transmons and a tunable three-mode coupler allowing for a ZZ interaction control. We experimentally demonstrate the native CZ gate with the pulse duration of 60 ns achieving the two-qubit gate fidelity above 98%, limited mostly by qubit coherence time. Numerical simulations show that by optimizing the gate duration the fidelity can be pushed over 99.97%.
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Higher Josephson harmonics in a tunable double-junction transmon qubit
An SIS junction in series with a SQUID gives a superconducting qubit with a flux-tunable second Josephson harmonic of about 10% of the fundamental.
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