Related papers: Resonator-mediated quantum gate between distant charge qubits

Resonator-mediated quantum gate between distant charge qubits

URL: http://arxiv.org/abs/2406.06442v2
Date: Sat, 26 Oct 2024 05:40:49 GMT
Title: Resonator-mediated quantum gate between distant charge qubits
Authors: Florian Kayatz, Jonas Mielke, Guido Burkard,
Abstract summary: We show that photons can mediate both an $imathrmSWAP$ gate as well as a $sqrtimathrmSWAP$ gate between two distant charge qubits. We conjecture that a decrease of the charge qubit dephasing rate by one order of magnitude is conjectured to result in gate fidelities surpassing 95%.
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Abstract: Strong charge-photon coupling allows the coherent coupling of a charge qubit, realized by a single charge carrier (either an electron or a hole) in a double quantum dot, to photons of a microwave resonator. Here, we theoretically demonstrate that, in the dispersive regime, the photons can mediate both an $i\mathrm{SWAP}$ gate as well as a $\sqrt{i\mathrm{SWAP}}$ gate between two distant charge qubits. We provide a thorough discussion of the impact of the dominant noise sources, resonator damping and charge qubit dephasing on the average gate fidelity. Assuming a state-of-the art resonator decay rate and charge qubit dephasing rate, the predicted average gate fidelities are below 90\%. However, a decrease of the charge qubit dephasing rate by one order of magnitude is conjectured to result in gate fidelities surpassing 95\%.

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