Cavity-based optical switching via phase modulation in warm rubidium vapor

• URL: http://arxiv.org/abs/2508.06255v2
• Date: Mon, 11 Aug 2025 09:11:32 GMT
• Title: Cavity-based optical switching via phase modulation in warm rubidium vapor
• Authors: Georgia Booton, Tabijah Wasawo, William O. C. Davis, Cameron McGarry, Kristina R. Rusimova, Alex O. C. Davis, Josh Nunn, Peter J. Mosley,
• Abstract summary: Optical switching remains a key outstanding challenge for scalable fault-tolerant photonic quantum computing.<n>We present a cavity-based optical switch that overcomes this limitation, demonstrating 22 ns rise time, insertion loss of 2.4 dB, and 17.5 dB extinction ratio.<n>The ultimate performance of our switch, combining both speed and efficiency, will find applications in active multiplexing, loop-based quantum memory, and feedforward for quantum error-correction protocols.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optical switching remains a key outstanding challenge for scalable fault-tolerant photonic quantum computing due to the trade-off between speed, bandwidth, and loss. Scalable quantum photonics demands all three, to enable high computational clock rates and resource efficient scaling to large systems. We present a cavity-based optical switch that overcomes this limitation, demonstrating 22 ns rise time, insertion loss of 2.4 dB, and 17.5 dB extinction ratio. All-optical control is achieved via phase modulation of a signal field detuned from the near-degenerate two-photon absorption ladder in warm rubidium vapor. The ultimate performance of our switch, combining both speed and efficiency, will find applications in active multiplexing, loop-based quantum memory, and feedforward for quantum error-correction protocols.

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