Subnatural-Linewidth Polarization-Entangled Photon Pairs with Controllable Temporal Length

Abstract

We demonstrate an efficient experimental scheme for producing polarization-entangled photon pairs from spontaneous four-wave mixing (SFWM) in a laser-cooled ${}^{85}$Rb atomic ensemble, with a bandwidth (as low as 0.8 MHz) much narrower than the rubidium atomic natural linewidth. By stabilizing the relative phase between the two SFWM paths in a Mach-Zehnder interferometer configuration, we are able to produce all four Bell states. These subnatural-linewidth photon pairs with polarization entanglement are ideal quantum information carriers for connecting remote atomic quantum nodes via efficient light-matter interaction in a photon-atom quantum network.

Title changed, published version, 5 pages + 3 pages Supplemental Material

References in corpus (4)

• The Quantum Internet
• Ultranarrow-Band Photon Pair Source Compatible with Solid State Quantum Memories and Telecommunication Networks
• Direct measurement of decoherence for entanglement between a photon and stored atomic excitation
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