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While infrared and optical single-photon detectors exist at high quantumefficiencies, detecting single microwave photons has been an ongoing challenge.Specifically, microwave photon detection is challenging compared to its opticalcounterpart as its energy scale is four to five orders of magnitude smaller,necessitating lower operating temperatures. Here, we propose a hybridspin-optomechanical interface to detect single microwave photons. The microwavephotons are coupled to a phononic resonator via piezoelectric actuation. Thisphononic cavity also acts as a photonic cavity with an embedded Silicon-Vacancy(SiV) center in diamond. Phonons mediate the quantum state transfer of themicrowave cavity to the SiV spin, in order to allow for high spin-mechanicalcoupling at the single quantum level. From this, the optical cavity is used toperform a cavity-enhanced single-shot readout of the spin-state. Here, startingwith a set of experimentally realizable parameters, we simulate the completeprotocol and estimate an overall detection success probability $P_s^0$ of$0.972$, Shannon's mutual information $I^{0}(X;Y)$ of $0.82\ln(2)$, and a totaldetection time of $\sim2$ $\mu s$. We also talk about the experimental regimesin which $P_s^0$ tends to near unity and $I^{0}(X;Y)$ tends to $\ln(2)$indicating exactly one bit of information retrieval about the presence orabsence of a microwave photon.

Microwave single-photon detection using a hybrid spin-optomechanical quantum interface