Superconducting resonators as beam splitters for linear-optics quantum computation.
We propose and analyze a technique for producing a beam-splitting quantum gate between two modes of a ring-resonator superconducting cavity. The cavity has two integrated superconducting quantum interference devices (SQUIDs) that are modulated by applying an external magnetic field. The gate is accomplished by applying a radio frequency pulse to one of the SQUIDs at the difference of the two mode frequencies. Departures from perfect beam splitting only arise from corrections to the rotating wave approximation; an exact calculation gives a fidelity of >0.9992. Our construction completes the toolkit for linear-optics quantum computing in circuit quantum electrodynamics.
Chirolli
Luca
L
Department of Physics, University of Konstanz, D-78457 Konstanz, Germany.
Burkard
Guido
G
Kumar
Shwetank
S
Divincenzo
David P
DP