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Input-output theory for spin-photon coupling in Si double quantum dots

Author(s): Benito, M; Mi, X; Taylor, JM; Petta, Jason R; Burkard, Guido

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Abstract: The interaction of qubits via microwave frequency photons enables long-distance qubit-qubit coupling and facilitates the realization of a large-scale quantum processor. However, qubits based on electron spins in semiconductor quantum dots have proven challenging to couple to microwave photons. In this theoretical work we show that a sizable coupling for a single electron spin is possible via spin-charge hybridization using a magnetic field gradient in a silicon double quantum dot. Based on parameters already shown in recent experiments, we predict optimal working points to achieve a coherent spin-photon coupling, an essential ingredient for the generation of long-range entanglement. Furthermore, we employ input-output theory to identify observable signatures of spin-photon coupling in the cavity output field, which may provide guidance to the experimental search for strong coupling in such spin-photon systems and opens the way to cavity-based readout of the spin qubit.
Publication Date: 15-Dec-2017
Electronic Publication Date: 22-Dec-2017
Citation: Benito, M, Mi, X, Taylor, JM, Petta, JR, Burkard, Guido. (2017). Input-output theory for spin-photon coupling in Si double quantum dots. PHYSICAL REVIEW B, 96 (10.1103/PhysRevB.96.235434
DOI: doi:10.1103/PhysRevB.96.235434
ISSN: 2469-9950
EISSN: 2469-9969
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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