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Atomic Physics Seminars

ics Atomic
Monday, February 11, 2013
3:30 PM
Physics Building, Room 204
Akira Tanaka [Host: Olivier Pfister]
The Institute of Scientific and Industrial Research, Osaka University
"Generation of ultra-broadband entangled photons from chirped-MgSLT crystal: towards mono-cycle temporal entanglement generation"
When the temporal correlation of two photons is compressed to the monocycle regime (3.56 fs, center wavelength: 1064 nm), one can expect new perspectives in quantum metrology, allowing applications such as submicron quantum optical coherence tomography and novel nonlinear optical experiments. For this aim, the two-photon state must essentially be ultra-broadband in the frequency domain and ultra-short in the time domain. In this seminar we report the successful generation of such ultra-broadband, frequency-correlated two-photon states via type-0, cw-pumped (532 nm) spontaneous parametric down conversion using four PPMgSLT crystals with different chirp rates of their poling periods. For the collinear condition, single-photon spectra are detected using a Si-CCD and an InGaAs photodiode array with a monochromator, while for a noncollinear condition, an NbN meander-type superconducting single photon detector (SNSPD) and an InP/GaAs photomultiplier tube (PMT) with a laser line Bragg tunable bandpass filter are used. The broadband sensitivity of the SNSPD and PMT in the near-infrared wavelength range enable singleshot observations with a maximum bandwidth of 820 nm among the four samples. Such spectra can in principle achieve a temporal correlation as short as 1.2 cycles (4.4 fs) with the use of appropriate phase compensation, which can be measured using the sum-frequency signal.

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