Entanglement-preserving frequency conversion in cold atoms

Abstract

We propose a method that enables efficient frequency conversion of quantum information based on recently demonstrated strong parametric coupling between two single-photon pulses propagating in a slow-light atomic medium at different group velocities. We show that an incoming single-photon state is efficiently converted into another optical mode in a lossless and shape-conserving manner. The persistence of initial quantum coherence and entanglement within frequency conversion is also demonstrated. We first illustrate this result for the case of small frequency difference of converted photons, and then discuss the modified scheme for conversion of photon wavelengths in different spectral ranges. Finally we analyze the generation of a narrow-band single-photon frequency-entangled state.

arXiv commentminor corrections compared to the published version, 7 pages, 5 figures

References in corpus (12)

• Long-distance quantum communication with atomic ensembles and linear optics
• Dark-State Polaritons in Electromagnetically Induced Transparency
• Quantum memory for photons: I. Dark state polaritons
• Generation of Nonclassical Photon Pairs for Scalable Quantum Communication with Atomic Ensembles
• Pulsed energy-time entangled twin-photon source for quantum communication
• A photonic quantum information interface
• Single-Photon Generation from Stored Excitation in an Atomic Ensemble
• Deterministic single photons via conditional quantum evolution
• Synchronized Independent Narrow-band Single Photons and Efficient Generation of Photonic Entanglement
• Nonclassical photon pairs generated from a room-temperature atomic ensemble
• Creation of a Photonic Time-bin Qubit via Parametric Interaction of Photons in a Driven Resonant Medium
• Quantum Theory for Generation of Nonclassical Photon Pairs by a Medium with Coherent Atomic Memory

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• Quantum Repeaters based on Deterministic Storage of a Single Photon in distant Atomic Ensembles
• Qubit transfer between photons at telecom and visible wavelengths in a slow-light atomic medium
• Single-photon frequency conversion in nonlinear crystals
• Entanglement transfer during quantum frequency conversion in gas-filled hollow-core fibers