BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:K. Thapliyal DTSTART:20240910T074000Z DTEND:20240910T091000Z DTSTAMP:20260423T040217Z UID:QOART/46 DESCRIPTION:Title: Q uantum state engineering of multi-mode and entangled optical fields using photon counting\nby K. Thapliyal as part of Quantum Optics and Related Topics\n\n\nAbstract\nNonclassical states\, having negative Glauber-Sudar shan P-function\, do not have a classical analogue.\nThese states have pav ed way for second quantum revolution and photonic quantum technology. A fe w\nexamples of generation of such states in nonlinear optical processes an d its challenges will be\ndiscussed. Photon number measurements and post-s election make a plethora of quantum state\nengineering operations feasible . Quantum state engineering using non-Gaussian operations provides\npowerf ul tool for continuous variable quantum information. Practical challenges in their\nimplementation and feasibility of generation of such states will be discussed [1-4]. Twin beams are\ngenerated in a nonlinear optical proc ess\, namely spontaneous parametric down conversion\, under\nstronger pump ing. They are endowed with ideally perfect photon number correlations in t he\nconstituting signal and idler beams. This quantum feature is revealed by the sub-shot noise photon\nnumber correlations. However\, the marginal signal and idler photon number distributions are\nmultimode thermal. We il lustrate the generation of engineered multimode quantum states from twin\n beams by photon subtraction and addition with supporting experimental real ization. Future prospects\,\nin view of our results\, will be discussed.\n \n[1] K. Thapliyal\, J. Peřina Jr.\, O. Haderka\, V. Michálek\, and R. M achulka\, Experimental characterization of\nmultimode photon-subtracted tw in beams\, Phys. Rev. Res. 6\, 013065 (2024).\n\n[2] J. Peřina Jr.\, K. T hapliyal\, O. Haderka\, V. Michálek\, and R. Machulka\, Generalized sub-P oissonian states of\ntwo-beam fields\, Opt. Express 32\, 537 (2024).\n\n[3 ] K. Thapliyal\, J. Peřina Jr.\, O. Haderka\, V. Michálek\, and R. Machu lka\, Experimental photon addition and\nsubtraction in multi-mode and enta ngled optical fields\, Opt. Lett. 49\, 4521 (2024).\n\n[4] J. Peřina Jr.\ , K. Thapliyal\, O. Haderka\, V. Michálek\, and R. Machulka\, Sub-Poisson ian twin beams\, Optica\nQuantum 2\, 148 (2024).\n LOCATION:https://researchseminars.org/talk/QOART/46/ END:VEVENT END:VCALENDAR