We offer a perspective on recent advances in picosecond-timescale all-optical switching with applications in quantum optics. The switch is based on polarization rotation in standard single-mode fiber via the optical Kerr effect. By using ultrafast laser pulses and short (∼10 cm) fibers, this technique can achieve a switching duration of ps, at the repetition rate of 80 MHz or above. This high repetition rate is well-suited to quantum optics where experiments operate in the photon-counting regime. The switch efficiency can be 99% with a noise floor of just photons/pulse, enabling high fidelity operations on quantum states of light, with negligible generation of spurious noise photons. We highlight the capabilities of this technique in four early applications: switching of heralded single photons, time-bin to polarization conversion of photonic qubits, noise gating for quantum key distribution, and pulse carving.
Perspectives on all-optical Kerr switching for quantum optical applications
Duncan England, Frédéric Bouchard, Kate Fenwick, Kent Bonsma-Fisher, Yingwen Zhang, Philip J. Bustard, Benjamin J. Sussman; Perspectives on all-optical Kerr switching for quantum optical applications. Appl. Phys. Lett. 18 October 2021; 119 (16): 160501. https://doi.org/10.1063/5.0065222
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