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Title: Quantum interference between single photons from a single atom and a cold atomic ensemble
Keywords: Hong Ou Mandel interference, hybrid quantum network, single atom, cold atomic ensemble, quantum optics, single photon
Issue Date: 5-Aug-2014
Source: SANDOKO KOSEN (2014-08-05). Quantum interference between single photons from a single atom and a cold atomic ensemble. ScholarBank@NUS Repository.
Abstract: Interfacing different physical systems is important for building a practical quantum information network as it can bring together the best features of each physical system. As a first step towards achieving this goal, we report on the observation of the Hong-Ou-Mandel (HOM) interference between the two single photons produced by two different physical systems. One single photon (6MHz bandwidth) is produced through spontaneous emission from a single 87Rb atom in an optical dipole trap. Another single photon (10MHz bandwidth) is produced based on the detection of one photon in a time-correlated photon pair produced via a four-wave mixing process in a cold atomic ensemble of 87Rb. In the first measurement, the two photons are made to arrive together at a 50:50 beam splitter. The coincidence measurements between detectors at the two outputs of the beam splitter shows an uncorrected interference visibility of 57(&177;3)% (corrected for background: 74(&177;3)%). We also examine the HOM effect for different time delays between the two photons as well as for different bandwidth of the atomic ensemble photon, and show that the behaviour agree with the theory.
Appears in Collections:Master's Theses (Open)

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