Continuous-wave nonclassical light with gigahertz squeezing bandwidth
Continuous-wave nonclassical light with gigahertz squeezing bandwidth
Squeezed states can be employed for entanglement-based continuous-variable quantum key distribution, where the secure key rate is proportional to the bandwidth of the squeezing. We produced a nonclassical cw laser field at the telecommunication wavelength of 1550 nm, which showed squeezing over a bandwidth of more than 2 GHz. The …