Superconducting quantum interference devices (SQUIDs) that incorporate two superconductor/insulator/superconductor (SIS) Josephson junctions in a closed loop form the core of some most sensitive detectors magnetic and electric fields currently available. SQUIDs these applications are typically operated with finite voltage which generates microwave radiation through ac effect. This may impact sy...

We use quantum field theory in curved spacetime to show that gravitational redshift induces a unitary transformation on the state of propagating photons. This occurs for realistic photons characterized by finite bandwidth, while ideal with sharp frequencies do not transform unitarily. find is mode-mixing operation, and we devise protocol exploits gravity induce Hong-Ou-Mandel-like interference ...

The relations between quantum coherence and quantum interference are discussed. A general method for generation of quantum coherence through interference-induced state selection is introduced and then applied to ‘simple’ atomic systems under two-photon transitions, with applications in quantum optics and laser cooling.