Magnon-mediated quantum gates for superconducting qubits,Physical Review B

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Magnon-mediated quantum gates for superconducting qubits
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-09 , DOI: 10.1103/physrevb.110.104416
Martijn Dols _{1,

2} , Sanchar Sharma _{3,

4,

5,

6} , Lenos Bechara ₁ , Yaroslav M. Blanter ₂ , Marios Kounalakis _{1,

2,

7} , Silvia Viola Kusminskiy _{1,

8}

Affiliation

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 (

X X + Y Y

), a longitudinal (

Z Z

), and a nontrivial

Z X

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

≳ 99 %

, while an icnot gate can be applied with an average fidelity

≳ 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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