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arXiv · 1606.04736

Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings

Félix Beaudoin·Dany Lachance-Quirion·W. A. Coish·Michel Pioro-Ladrière
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Abstract

Microwave-frequency superconducting resonators are ideally suited to perform dispersive qubit readout, to mediate two-qubit gates, and to shuttle states between distant quantum systems. A prerequisite for these applications is a strong qubit-resonator coupling. Strong coupling between an electron-spin qubit and a microwave resonator can be achieved by correlating spin- and orbital degrees of freedom. This correlation can be achieved through the Zeeman coupling of a single electron in a double quantum dot to a spatially inhomogeneous magnetic field generated by a nearby nanomagnet. In this paper, we consider such a device and estimate spin-resonator couplings of order ~ 1 MHz with realistic parameters. Further, through realistic simulations, we show that precise placement of the double dot relative to the nanomagnet allows to select between a purely longitudinal coupling (commuting with the bare spin Hamiltonian) and a purely transverse (spin non-conserving) coupling. Additionally, we suggest methods to mitigate dephasing and relaxation channels that are introduced in this coupling scheme. This analysis gives a clear route toward the realization of coherent state transfer between a microwave resonator and a single electron spin in a GaAs double quantum dot with a fidelity above 90%. Improved dynamical decoupling sequences, low-noise environments, and longer-lived microwave cavity modes may lead to substantially higher fidelities in the near future.

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Félix Beaudoin, Dany Lachance-Quirion, W. A. Coish, Michel Pioro-Ladrière. 2016-10-17. Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings. https://doi.org/10.1088/0957-4484%2F27%2F46%2F464003

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