Quantum interference between two single photons of different microwave frequencies.
We have measured quantum interference between two single microwave photons trapped in the same 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.
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. francois.nguyen@colorado.edu
François
F
Nguyen
Eva
E
Zakka-Bajjani
Raymond W
RW
Simmonds
José
J
Aumentado