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Atomic Physics Seminars

ics Atomic
Monday, May 14, 2018
11:00 AM
Physics Building, Room 313
Note special time.
Note special room.
Rajveer Nehra [Host: Olivier Pfister]
UVA-Department of Physics
"Quantum state preparation and characterization using photon-number-resolving measurements"

Quantum state preparation and characterization are essential to emerging near-term quantum technological applications. In particular, single-photon Fock states are of interest as their exciting applications in linear optical quantum computing, quantum internet, quantum communication, quantum sensing, and quantum imaging.

In this work we prepare a single-photon Fock state by heralding two-mode spontaneous parametric down conversion in a PPKTP based optical parametric oscillator (OPO). We then reconstruct the Wigner quasi-probability distribution by Photon-Number-Resolving (PNR) based quantum state tomography. This method circumvents the need for numerical tomographic reconstruction of the state by inverse Radon transform with the balanced homodyne detection method. We perform PNR measurements using transition edge sensor which can resolve up to five photons at 1064 nm. Here we report our recent results of reconstructed negative Wigner function with a final detection efficiency of 56 %.

Towards the end of my talk, I will discuss a method known as Fock state filtering to generate non-classical states using single-photon states, linear optics and PNR resolving measurements.

To add a speaker, send an email to phys-speakers@Virginia.EDU. Please include the seminar type (e.g. Atomic Physics Seminars), date, name of the speaker, title of talk, and an abstract (if available).