Three-particle entanglement from entangled photon pairs and a weak coherent state

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 59, Issue 1, 1999, Pages R35-R38

  Rarity, J G ^a   Tapster, P R ^a  

^a DEFENCE SCIENCE AND TECHNOLOGY LABORATORY   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0002970519     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.59.R35     Document Type: Article

References (24)

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20. A. Heisenberg-limited single-photon wave packet has a duration set by the Fourier transform of its bandwidth. In practice the pump laser has a bandwidth (Formula presented) and pulse duration (Formula presented) We use a detector filter with width (Formula presented) giving an effective coherence length for the down-converted beams and the weak state (Formula presented) To obtain high visibility interference we need coherence within the pulse, which we obtain when we limit the detector filter to give (Formula presented) In other words, the detection of a photon has a fundamental time uncertainty set by the filter width, and is longer than the initial pump pulse length. Detections from the separate sources can then be made fully indistinguishable by spatial filtering into a single spatial mode. The filtering reduces the effective efficiency of the source by a factor of order (Formula presented) but with Gaussian filters the interference visibility falls like (Formula presented) which gives high visibility (Formula presented) for (Formula presented) (see Ref. 12).
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