Entropy of entanglement in the continuous frequency space of the biphoton state from multiplexed cold atomic ensembles. (21st January 2016)

• Record Type: Journal Article
• Authors: Jen, H H
• Is Part Of: Journal of physics. Volume 49:Number 3(2016:Feb. 01)
• Publication Date: 2016-01-21
• Subjects: quantum communication -- entropy of entanglement -- cascade spontaneous emissions; 42.50.Dv -- 03.67.Bg -- 03.67.Hk; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/0953-4075/49/3/035503
• Languages: English
• ISSNs: 0953-4075

Abstract

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 can 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.