Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 103: Transport: Poster Session

TT 103.47: Poster

Thursday, March 19, 2015, 15:00–18:00, Poster B

Microwave readout of Majorana qubits — •Christoph Ohm and Fabian Hassler — JARA Institute for Quantum Information, RWTH Aachen University, 52056 Aachen, Germany

Majorana qubits offer a promising way to store and manipulate quantum information in a topologically protected way. Being immune to local noise the information is inherently hard to access rendering a measurement of the qubit state a challenging task. Here, we propose a readout scheme for Majorana qubits relying on the basic effect that voltage-biased Josephson junctions hosting Majorana fermions emit and absorb microwave photons at half of the Josephson frequency. Using standard tools from microwave engineering we show that in the dispersive regime our setup allows to perform a quantum non-demolition measurement and to reach the quantum limit. An appealing feature of our setup is that the interaction of the Majorana qubit with the measurement device can be turned on and off at will by changing the dc bias of the junction.