Fast, low-loss, all-optical phase modulation in warm rubidium vapour
William O C Davis, Paul Burdekin, Tabijah Wasawo +4 more
Abstract Low-loss high-speed switches are an integral component of future photonic quantum technologies, with applications in state generation, multiplexing, and the implementation of quantum gates. Phase modulation is one method of achieving this switching; however, existing optical phase modulators offer either high bandwidth or low loss—not both. We demonstrate fast (100 MHz bandwidth), low-loss ( 83 ( 2 ) % transmission) phase shifting ( Δ ϕ = ( 0.90 ( 5 ) ) π ) in a signal field, induced by a control field, and mediated by the two-photon 5 S 1 / 2 → 5 P 3 / 2 → 5 D 5 / 2 transition in 87 Rb vapour. The all-optical nature of the scheme circumvents restrictions of electronic phase modulators, where bandwidth and repetition rate can be limited by the requirement to rapidly modulate high voltages. We discuss routes to enhance both performance and scalability for application to a range of quantum and classical technologies.
arXiv:2309.04313•Quantum Science and Technology•Dec 16, 2024•5 citations