paper

Quantum interference between two single photons of different microwave frequencies

arXiv:1112.1943 · doi:10.1103/PhysRevLett.108.163602

Abstract

We have measured quantum interference between two single microwave photons trapped in a superconducting resonator, whose frequencies are initially about 6 GHz apart. We accomplish this by use of a parametric frequency conversion process that mixes the mode currents of two cavity harmonics through a superconducting quantum interference device, and demonstrate that a two-photon entanglement operation can be performed with high fidelity.

6 pages and 3 figures

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