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Proceedings Paper

Spectral properties of ultra-broadband entangled photons generated from chirped-MgSLT crystal towards monocycle entanglement generation
Author(s): Akira Tanaka; Ryo Okamoto; Hwan Hong Lim; Shanthi Subashchandran; Masayuki Okano; Labao Zhang; Lin Kang; Jian Chen; Peiheng Wu; Toru Hirohata; Sunao Kurimura; Shigeki Takeuchi
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Paper Abstract

Compressing the temporal correlation of two photons to the monocycle regime (3.56 fs, center wavelength: 1064 nm) is expected to open up new perspectives in quantum metrology, allowing applications such as submicron quantum optical coherence tomography and novel nonlinear optical experiments. To achieve this, the two-photon state must essentially be ultra-broadband in the frequency domain and ultra-short in the time domain. Here, 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. We also discuss several detection strategies for measuring coincidence counts in the presence of wavelength-dependent optical elements as a step towards frequency correlation measurements.

Paper Details

Date Published: 29 March 2013
PDF: 8 pages
Proc. SPIE 8635, Advances in Photonics of Quantum Computing, Memory, and Communication VI, 86350X (29 March 2013); doi: 10.1117/12.2003390
Show Author Affiliations
Akira Tanaka, Hokkaido Univ. (Japan)
Osaka Univ. (Japan)
Ryo Okamoto, Hokkaido Univ. (Japan)
Osaka Univ. (Japan)
Hwan Hong Lim, National Institute for Materials Science (Japan)
Shanthi Subashchandran, Hokkaido Univ. (Japan)
Osaka Univ. (Japan)
Masayuki Okano, Hokkaido Univ. (Japan)
Osaka Univ. (Japan)
Labao Zhang, Nanjing Univ. (China)
Lin Kang, Nanjing Univ. (China)
Jian Chen, Nanjing Univ. (China)
Peiheng Wu, Nanjing Univ. (China)
Toru Hirohata, Hamamatsu Photonics K.K. (Japan)
Sunao Kurimura, National Institute for Materials Science (Japan)
Shigeki Takeuchi, Hokkaido Univ. (Japan)
Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 8635:
Advances in Photonics of Quantum Computing, Memory, and Communication VI
Zameer U. Hasan; Philip R. Hemmer; Hwang Lee; Charles M. Santori, Editor(s)

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