Quantum sensing technologies

In this paper polarization and hybrid entangled source of light which were built using a fully on-chip battery-powered source of entangled photons will be discussed. These devices use monolithically integrated Bragg reflection waveguide laser diode (BRL) enabling high fidelity, record flux, compact photon pairs to be generated via a type-II intracavity phase-matching process. Furthermore, our turnkey source of entangled photon pairs operates at room temperature and does not require any external components or compensation. These qualities enable our chip to be optimal for highly scalable sources and remote operation. In addition, this talk will also discuss the first on-chip phase-sensitive amplifier utilizing χ(2) nonlinearity. These devices demonstrated the highest reported gain per unit length (devices with effective length ~ 0.1 mm providing gain exceeding 28 dB). Unique to χ(2) nonlinearity is that it also permits a pump that is spectrally far separated from the interacting signal and idler, allowing the highest reported sensitivity in any phase-sensitive amplifier (amplification capability down to an input of 0.005 photon per pulse). One of the main advantages of phase-sensitive amplifiers is their ability to reach a 0 dB noise figure, which enables many applications in quantum photonics.