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Efficient on-chip source of microwave photon pairs in superconducting circuit QED

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Marquardt, F. (2007). Efficient on-chip source of microwave photon pairs in superconducting circuit QED. PHYSICAL REVIEW B, 76(20): 205416. doi:10.1103/PhysRevB.76.205416.


Cite as: http://hdl.handle.net/21.11116/0000-0001-DD6A-0
Abstract
We describe a scheme for the efficient generation of microwave photon pairs by parametric down-conversion in a superconducting transmission line resonator coupled to a Cooper-pair box serving as an artificial atom. By properly tuning the first three levels with respect to the cavity modes, the down-conversion probability may reach the percentage level at good fidelity. We show this by numerically simulating the dissipative quantum dynamics of the coupled cavity-box system and discussing the effects of dephasing and relaxation in the solid state environment. The setup analyzed here might form the basis for a future on-chip source of entangled microwave photons, e.g., using Franson's idea of energy-time entanglement.