IQIM Postdoctoral and Graduate Student Seminar

Abstract:

Quantum entanglement plays the key role in quantum technologies such as quantum information science and quantum metrology. Quantum optical coherence tomography (QOCT) is a tomographic imaging scheme that utilizes the two-photon interference of quantum entangled photons [1]. QOCT has been expected to extend the possibility of the classical optical coherence tomography (OCT), which has already been used in medicine and biology [2]. Although the OCT suffers from the degradation of the resolution due to the dispersion, the QOCT can cancel it in principle by virtue of the quantum correlation. In our previous studies, we have demonstrated the perfect dispersion tolerance in 3 μm-resolution QOCT [3]. In order to achieve the higher-resolution two-photon interferometer, the broader bandwidth of frequency correlation of entangled photon pairs is required. Recently, broadband entangled photon pairs have attracted much attention [4] and actually been generated [5-7]. In this talk I report the generation of ultra-broadband entangled photon pairs (163-THz bandwidth) and the realization of the ultra-narrow two-photon interferometer (3.6-fs temporal width), which corresponds to 0.54 μm-resolution QOCT [8]. Furthermore, I demonstrate the dispersion tolerance for a water. This world-highest resolution QOCT with the dispersion tolerance can be the powerful tomographic imaging technique in quantum metrology and offer the important insights for the quantum optics using multiple photon interferences.

References:
[1]    M. B. Nasr, B.E.A. Saleh, A.V. Sergienko and M.C. Teich, Phys. Rev. Lett. 91, 083601 (2003).; [2]    M. E. Brezinski, Optical Coherence Tomography (Academic, USA 2006); [3]    M. Okano, R. Okamoto, A. Tanaka, S. Subashchandran and S. Takeuchi, Phys. Rev. A 88, 043845 (2013); [4]    S. E. Harris, Phys. Rev. Lett. 98, 063602 (2007); [5]    M. B. Nasr, S. Carrasco, B.E.A. Saleh, A.V. Sergienko, M.C. Teich, J. P. Torres, L. Torner, D. S. Hum and M. M. Fejer, Phys. Rev. Lett. 100, 183601 (2008); [6]    M. Okano, R. Okamoto,  A. Tanaka, S. Subashchandran and S. Takeuchi, Opt. Express 20, 13977-13987 (2012); [7]    A. Tanaka, R. Okamoto, H.H. Lim, S. Subashchandran, M. Okano, L. Zhang, L. Kang, J. Chen, P. Wu, T. Hirohata, S. Kurimura and S. Takeuchi, Opt. Express 20, 25228-25238 (2012); [8]    M. Okano et. al., manuscript in preparation.

 - Lunch will be served following the seminar on the Bridge patio.