KEYWORDS: Single photon, Four wave mixing, Time-frequency analysis, Photons, Chemical species, Clouds, Modulation, Visibility, Photodetectors, Quantum information processing
Narrow-band time-frequency entangled biphotons are generated from spontaneous four-wave mixing in cold atom clouds.
The coherence time of the entangled biphotons can be extended to sub-microseconds by the slow light effect. The
temporal wavefunction of the biphotons can be manipulated through modulating the spectral or spatial mode of the
controlling laser beams. Concerning a pair of entangled biphoton and the resulting heralded single photon, it was
commonly believed that, time-frequency entanglement damages the temporal purity of the single photon. However, the
case is totally different for biphotons with long coherence time which is far beyond the time resolution of single-photondetectors.
We demonstrate that, the single photon heralded from these time-frequency entangled biphotons is in a pure
temporal state. Therefore, single photons are able to be shaped through the time-frequency entanglement with their
partner photons, while the single photons could be found to be still in a pure state and thus useful for quantum
information processing and communication technology.
Conference Committee Involvement (7)
Quantum and Nonlinear Optics VI
21 October 2019 | Hangzhou, China
Quantum and Nonlinear Optics V
11 October 2018 | Beijing, China
Quantum and Nonlinear Optics IV
12 October 2016 | Beijing, China
Quantum and Nonlinear Optics III
9 October 2014 | Beijing, China
Quantum and Nonlinear Optics II
5 November 2012 | Beijing, China
Quantum and Nonlinear Optics
18 October 2010 | Beijing, China
Quantum Optics and Applications in Computing and Communications
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