Superconducting Resonators as Beam Splitters for Linear-Optics Quantum Computation
Luca Chirolli, Guido Burkard, Shwetank Kumar, David P. DiVincenzo
DOI 10.1103/PhysRevLett.104.230502 · Physical Review Letters
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Abstract
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.
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