Detecting an Itinerant Optical Photon Twice without Destroying It

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.

8 pages, 6 figures

References in corpus (8)

• The Quantum Internet
• Nanophotonic quantum phase switch with a single atom
• Progressive field-state collapse and quantum non-demolition photon counting
• A quantum logic gate between a solid-state quantum bit and a photon
• Nondestructive detection of photonic qubits
• Long-distance atom-photon entanglement
• Single-Photon Distillation via a Photonic Parity Measurement Using Cavity QED
• Quantum telescopes

Cited by in corpus (1)

• Closed-System Solution of the 1D Atom from Collision Model