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Long-Range Microwave Mediated Interactions Between Electron Spins

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arxiv 1905.00776 v1 pith:JXNCZ3F7 submitted 2019-05-02 cond-mat.mes-hall quant-ph

F. Borjans , X. G. Croot , X. Mi , M. J. Gullans , J. R. Petta This is my paper · ORCID
classification cond-mat.mes-hallquant-ph
keywords spinscoherentcouplingdemonstrateelectrongatesinteractioninteractions
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Entangling gates for electron spins in semiconductor quantum dots are generally based on exchange, a short-ranged interaction that requires wavefunction overlap. Coherent spin-photon coupling raises the prospect of using photons as long-distance interconnects for spin qubits. Realizing a key milestone for spin-based quantum information processing, we demonstrate microwave-mediated spin-spin interactions between two electrons that are physically separated by more than 4 mm. Coherent spin-photon coupling is demonstrated for each individual spin using microwave transmission spectroscopy. An enhanced vacuum Rabi splitting is observed when both spins are tuned into resonance with the cavity, indicative of a coherent spin-spin interaction. Our results demonstrate that microwave-frequency photons can be used as a resource to generate long-range two-qubit gates between spatially separated spins.

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  1. Continuous monitoring of a trapped, superconducting spin

    cond-mat.mes-hall 2019-08 conditional novelty 8.0 of 10

    A trapped superconducting quasiparticle's spin was read out in a single shot through a microwave resonator, with 92% QND fidelity, enabling real-time spin monitoring.

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