Magnon-mediated quantum gates for superconducting qubits

Abstract

We propose a hybrid quantum system consisting of a magnetic particle inductively coupled to two superconducting transmon qubits, where qubit-qubit interactions are mediated via magnons. We show that the system can be tuned into three different regimes of effective qubit-qubit interactions, namely a transverse ($XX+YY$), a longitudinal ($ZZ$) and a non-trivial $ZX$ interaction. In addition, we show that an enhanced coupling can be achieved by employing an ellipsoidal magnet, carrying anisotropic magnetic fluctuations. We propose a scheme for realizing two-qubit gates, and simulate their performance under realistic experimental conditions. We find that iSWAP and CZ gates can be performed in this setup with an average fidelity $\gtrsim 99\%$ , while an iCNOT gate can be applied with an average fidelity $\gtrsim 88\%$. Our proposed hybrid circuit architecture offers an alternative platform for realizing two-qubit gates between superconducting qubits and could be employed for constructing qubit networks using magnons as mediators.

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Cited by in corpus (5)

• Electric polarization induced by magnons and magnon Nernst effects
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• Quantum sensing magnonic number states using a bosonic mode as the probe
• Optical signatures of quantum skyrmions
• Phonon- and magnon-mediated decoherence of a magnonic qubit