Top-transmon: hybrid superconducting qubit for parity-protected quantum computation

Details Top-transmon: hybrid superconducting qubit for parity-protected quantum computation Top-transmon: hybrid superconducting qubit for parity-protected quantum computation

2011-05-02

arxiv.org/abs/1105.0315v1

New J. Phys. 13, 095004 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures

Scientific paper

10.1088/1367-2630/13/9/095004

Qubits constructed from uncoupled Majorana fermions are protected from decoherence, but to perform a quantum computation this topological protection needs to be broken. Parity-protected quantum computation breaks the protection in a minimally invasive way, by coupling directly to the fermion parity of the system --- irrespective of any quasiparticle excitations. Here we propose to use a superconducting charge qubit in a transmission line resonator (a socalled transmon) to perform parity-protected rotations and read-out of a topological (top) qubit. The advantage over an earlier proposal using a flux qubit is that the coupling can be switched on and off with exponential accuracy, promising a reduced sensitivity to charge noise.

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