Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 21: Quantum Nanophotonics in Solid State Systems

HL 21.1: Vortrag

Dienstag, 2. April 2019, 14:00–14:15, H33

Single-spin-readout via spin-selective tunnelling aided by a microwave resonator — •Florian Ginzel, Maximilian Russ, and Guido Burkard — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

Recent implementations of the energy-selective schemes for single-spin-readout encountered limitations for its use in quantum information processing or sensing [1]. In this theoretical work an alternative detection method is proposed where a microwave resonator is used to read out the spin state through the state-dependent dispersive shift of the cavity frequency [2,3]. Using input-output-theory the expectation value and variance of the output field of the cavity are calculated from an idealised model. The cavity response to spin-dependent charge transitions distinguishes the initial spin-states of the electron with high fidelity. The feasibility of the cavity mediated spin-readout is discussed and the optimal operating regime is indicated.

1ex[1] D.M. Zajac et al., Science 359, 439 (2018)

[2] K.D. Petersson et al., Nature 490, 380 (2012)

[3] G. Burkard, J.R. Petta, Phys. Rev. B 94, 195305 (2016)