Parity-to-charge conversion in Majorana qubit readout
- URL: http://arxiv.org/abs/2004.02123v2
- Date: Mon, 13 Apr 2020 07:55:13 GMT
- Title: Parity-to-charge conversion in Majorana qubit readout
- Authors: Morten I. K. Munk and Jens Schulenborg and Reinhold Egger and Karsten
Flensberg
- Abstract summary: We study the time-dependent effect of Markovian readout processes on Majorana qubits whose parity degrees of freedom are converted into the charge of a tunnel-coupled quantum dot.
By applying a recently established effective Lindbladian approximation [1-3], we obtain a completely positive and trace preserving Lindblad master equation for the combined dot-qubit dynamics.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We study the time-dependent effect of Markovian readout processes on Majorana
qubits whose parity degrees of freedom are converted into the charge of a
tunnel-coupled quantum dot. By applying a recently established effective
Lindbladian approximation [1-3], we obtain a completely positive and trace
preserving Lindblad master equation for the combined dot-qubit dynamics,
describing relaxation and decoherence processes beyond the rotating-wave
approximation. This approach is applicable to a wide range of weakly coupled
environments representing experimentally relevant readout devices. We study in
detail the case of thermal decay in the presence of a generic Ohmic bosonic
bath, in particular for potential fluctuations in an electromagnetic circuit.
In addition, we consider the nonequilibrium measurement environment for a
parity readout using a quantum point contact capacitively coupled to the dot
charge.
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