Theory of fermion parity measurement and control in Majorana circuit quantum electrodynamics

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• Eran Ginossar, Surrey
• Thursday 18 February 2016, 13:45-15:00
• Theory Library.

If you have a question about this talk, please contact Mike Gunn.

Combining superconducting qubits with mesoscopic devices that carry topological states of matter may lead to compact and improved qubit devices with properties useful for fault-tolerant quantum computation. We introduce a charge qubit device based on a topological superconductor circuit and show that signatures of Majorana fermions could be detected. This device stores quantum information in coherent superpositions of fermion parity states originating from the Majorana fermions, generating a highly isolated qubit whose coherence time could be greatly enhanced. We study the effect of the Majorana fermions on the quantum electrodynamics of the device embedded within an optical cavity and develop protocols to initialise, control and measure the parity states. We show that, remarkably, the parity eigenvalue is revealed via dispersive shifts of the optical cavity in the strong coupling regime and its state can be coherently manipulated via a second order sideband transition.

References: [1] Microwave transitions as a signature of coherent parity mixing effects in the Majorana-transmon qubit, Eran Ginossar and Eytan Grosfeld, Nature Communications 5, 4772 (2014) [2] Fermion parity measurement and control in Majorana circuit quantum electrodynamics, Konstantin Yavilberg, Eran Ginossar, Eytan Grosfeld, Phys. Rev. B 92 , 075143 (2015)

This talk is part of the Theoretical Physics Seminars series.

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