Entropy of entanglement in continuous frequency space of the biphoton state from multiplexed cold atomic ensembles

Abstract

We consider a scheme of multiplexed cold atomic ensembles that generate a frequency-entangled biphoton state with controllable entropy of entanglement. The biphoton state consists of a telecommunication photon (signal) immediately followed by an infrared one (idler) via four-wave mixing with two classical pump fields. Multiplexing the atomic ensembles with frequency and phase-shifted signal and idler emissions, we can manipulate and control the spectral property of the biphoton state. Mapping out the entropy of entanglement in the scheme provides the optimal configuration for entanglement resources. This paves the way for efficient long-distance quantum communication and for potentially useful multimode structures in quantum information processing.

7 figures, to be published in J. Phys. B

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Cited by in corpus (5)

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• Cooperative light scattering from helical-phase-imprinted atomic rings
• Cascaded cold atomic ensembles in a diamond configuration as a spectrally entangled multiphoton source
• Almost indistinguishable single photons via multiplexing cascaded biphotons with cavity modulation and phase compensation
• Spectral compression and entanglement reduction in the cascaded biphoton state with cavities