Publications associated with Ultrafast quantum optics and optical metrology

Strain-optic active control for quantum integrated photonics.

Optics express 22 (2014) 21719-21726

PC Humphreys, BJ Metcalf, JB Spring, M Moore, PS Salter, MJ Booth, W Steven Kolthammer, IA Walmsley

We present a practical method for active phase control on a photonic chip that has immediate applications in quantum photonics. Our approach uses strain-optic modification of the refractive index of individual waveguides, effected by a millimeter-scale mechanical actuator. The resulting phase change of propagating optical fields is rapid and polarization-dependent, enabling quantum applications that require active control and polarization encoding. We demonstrate strain-optic control of non-classical states of light in silica, showing the generation of 2-photon polarisation N00N states by manipulating Hong-Ou-Mandel interference. We also demonstrate switching times of a few microseconds, which are sufficient for silica-based feed-forward control of photonic quantum states.

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