Detecting an Itinerant Optical Photon Twice without Destroying It
- URL: http://arxiv.org/abs/2105.14354v1
- Date: Sat, 29 May 2021 18:48:31 GMT
- Title: Detecting an Itinerant Optical Photon Twice without Destroying It
- Authors: Emanuele Distante, Severin Daiss, Stefan Langenfeld, Lukas Hartung,
Philip Thomas, Olivier Morin, Gerhard Rempe, Stephan Welte
- Abstract summary: Two identical nondestructive photon detectors repeatedly detect and track a single photon propagating through a $60,mathrmm$ long optical fiber.
By demonstrating that the combined signal-to-noise ratio of the two detectors surpasses each single one by about two orders of magnitude, we experimentally verify a key practical benefit of cascaded non-demolition detectors.
- Score: 2.9316801942271304
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Nondestructive quantum measurements are central for quantum physics
applications ranging from quantum sensing to quantum computing and quantum
communication. Employing the toolbox of cavity quantum electrodynamics, we here
concatenate two identical nondestructive photon detectors to repeatedly detect
and track a single photon propagating through a $60\,\mathrm{m}$ long optical
fiber. By demonstrating that the combined signal-to-noise ratio of the two
detectors surpasses each single one by about two orders of magnitude, we
experimentally verify a key practical benefit of cascaded non-demolition
detectors compared to conventional absorbing devices.
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