Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 80: Enabling Technologies: Cavity QED

FM 80.2: Talk

Thursday, September 26, 2019, 14:30–14:45, 2006

Quantum measurement of a single spin via energy-selective tunneling in a microwave resonator — •Florian Ginzel, Maximilian Russ, and Guido Burkard — University of Konstanz, D-78457 Konstanz, Germany

A modification of the Elzerman scheme for single-shot electron spin readout in a quantum dot embedded into a superconducting cavity is proposed and discussed. Depending on its spin state the electron can tunnel between two quantum dots or between the two dots and a lead. One of the dots is capacitively coupled to a microwave resonator whose output signal is monitored to recover the initial spin state. In this work a model to estimate expectation value and variance of the cavity response is presented. The feasibility of the proposed scheme is discussed by means of timescale, visibility and quantum mechanical back-action of the measurement. As a result, cavity-aided spin readout via spin-selective tunneling is expected to allow for fast, high fidelity measurements and, thus, fulfill a crucial requirement for usage in various quantum technologies ranging from information processing to sensing.