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Frontiers in Optics

Ultrabroadband spontaneous parametric fluorescence in 800 nm region toward ultrahigh-resolution quantum optical coherence tomography

Masayuki Okano, Hwan Hong Lim, Ryo Okamoto, Akira Tanaka, Yuichi Nagamatsu, Norihiko Nishizawa, Sunao Kurimura, Shigeki Takeuchi

Published Jan 1, 2014• 1 citation
Publisher

Abstract

Quantum optical coherence tomography can realize high-resolution imaging with dispersion tolerance by virtue of quantum entanglement. We generate ultrabroadband spontaneous parametric fluorescence from chirped quasi-phase matching devices to achieve the ultrahigh-resolution imaging.
DOI
10.1364/fio.2014.fw1c.4

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Quantum technologies harness the intrinsic nature of quantum physics to beat limitations of classical methods. Recently, the application of quantum entanglement to metrology has attracted much attention. Quantum optical coherence tomography (QOCT) using two-photon interference between entangled photon pairs can overcome certain problems with classical optical coherence tomography (OCT). As the resolution of OCT becomes higher, degradation of the resolution due to dispersion becomes more critical. Here we show our work on the realization of 0.54 μm resolution two-photon interference, which surpasses the current record resolution 0.75 μm for OCT. In addition, the resolution for QOCT showed almost no change even when a 1-mm-thick water was inserted in the path of the interferometer. The results presented here represent a breakthrough for the realization of ultrahigh-resolution quantum metrology. Our work will open up possibilities for medical and biological applications.
As some of the most promising quantum applications such as high resolution quantum optical coherence tomography (QOCT) [1] with dispersion cancellation as well as quantum key distribution require frequency entanglement. Therefore, frequency entanglement light sources are an essential importance for implement of many quantum optical applications. So Far, the most prominent method used for the entangled photon pair generation is spontaneous parametric down-conversion (SPDC) in nonlinear crystals. Recently, with adopting chirp quasi-phase matching (QPM) PPSLT (periodically poled stoichiometric lithium tantalate) has been used as source of entangled photons with large bandwidth [2]. However, improving the overall system efficiency is still remain challenging.