Quantum Imaging and Correlation Measurement with Undetected Photons

by Dr Dr. Mayukh Lahiri (Faculty of Physics, University of Vienna and IQOQI Vienna)

Thursday 22 Feb 2018, 16:00 → 17:00 Asia/Kolkata

AG - 80 (TIFR, Mumbai)

A recent application of the principle of complementarity has led to a unique imaging technique in which the photon interacting with an object is not detected to obtain the image [1,2]. We will discuss the associated theory and then show how it leads to a new research direction in the field of quantum information science, where the measurement of correlation between two or more particles is of crucial importance. In particular, a method of measuring the correlation between the momenta of two photons will be presented [3,4] in which only one of the photons is detected.This method can be extended to verify the entanglement of a two-photon mixed state. The method enables us to consider wavelengths for which good detectors are not available, thereby extending the experimental reach further. [1] GB Lemos, et al. Nature 512, 409 (2014). [2] M Lahiri, R Lapkiewicz, GB Lemos and A Zeilinger, Phys. Rev. A 92, 013832 (2015). [3] M Lahiri, A Hochrainer, R Lapkiewicz, GB Lemos and A Zeilinger, Phys. Rev. A 96, 013822 (2017). [4] A Hochrainer, M Lahiri, R Lapkiewicz, GB Lemos and A Zeilinger, Proc. Natl. Acad. Sci.(USA) 114, 1508 (2017).