Squeezed states act as a resource in many quantum optics applications. For example, they can be used in metrology to achieve sensitivities beyond the quantum limit or they can be used as the building block of quantum computing architectures such as cluster state quantum computing. Naturally, integrating the systems that enable squeezed light production will increase the suitability for real-world applications, owing to their smaller footprints, ability to combine multiple functionalities, and compatibility with fibre networks. Although integrated sources of squeezed light have been previously shown in waveguide resonators, the laser frequency has been typically locked to the resonance condition of the resonator. This scheme, however, is not suitable for network applications where many squeezed light sources are generally required to operate at the same frequency. In this work we present a waveguide resonator realised in a titanium indiffused lithium niobate waveguide that includes an integrated phase modulator that allows, for the first time, locking of the waveguide resonator to the laser frequency, thereby making the device suitable for network applications.
DOI:https://doi.org/10.1364/OE.498423
