# Quantum Fields and Quantum Information

Welcome to Pfister Labs!

## News

10/11/2022: New paper accepted in Nature Photonics: exciting collaboration with CUNY, AFRL, and JLab!

M. Eaton, A. Hossameldin, R.J. Birrittella, P.M. Alsing, Ch.C. Gerry, Ch.Cuevas, H. Dong, and O. Pfister, Resolution of 100 photons and quantum generation of unbiased random numbers, arXiv:2205.01221

05/13/2022: Spring 2022 QFQI party

Left to right: Xuan Zhu, Zijiao Yang (special guest from Xu Yi's group :-), Andrew AbdelMalak, Alison Haskins, Santiago Pinto, Olivia Mostow, Dr. Carlos González-Arciniegas, Dr. Miller Eaton, Amr Hossameldin, Amanuel Anteneh, Dr. Paul Renault, and Dr. Boss.

04/12/2022: Congratulations to our newly minted PhD Miller Eaton! The quantum workforce gains another power hitter.

Watch a very short intro video to our research!

01/21/2021: Our group is looking for a postdoc in experimental quantum optics and quantum information (theory considered as well but experiment a priority). Apply here.

07/22/2020: Congratulations to our newly minted PhD Raj Nehra (left, below, with brilliant former group postdoc Dr. Raf Alexander). Fantastic job, Raj! Have fun at Caltech!

07/16/2020: Olivier was honored to give the Quantum Science Seminar #13! Watch it here .

11/13/2019: Group dinner for visiting student Nicolas Fabre, from Pérola Milman's group at Paris Université, at the Whiskey Jar, feat. The Weedeaters.

Left to right: Prof. Rongguo Yang (Shanxi U., visiting), Prof. Jing Zhang (Shanxi U., visiting), Dr. Anne Pfister, Dr. Fearless Leader, Dr. Carlos González-Arciniegas, Rajveer Nehra, Matthew Wampler (Israel Klich's group), Chun-Hung Chang, Zijiao Yang (Xu Yi's group), Catherine Xuan Zhu, Nicolas Fabre, Miller Eaton.

## About us

We are an experimental quantum optics shop with a strong quantum information bias. We're based at the U. of Virginia, where we have been pursuing the implementation of quantum computing with light since 2004. Progress along these lines has made us develop unique expertise in generating quantum entanglement over very large scales in the lab. Our other line of effort is the generation and complete characterization of highly exotic, deemed "non Gaussian," quantum states of light, which are critical for quantum error correction and for the exponential speedup of a quantum computer.

## Group members

### Fearless Leader

### Postdocs

Léandre Brunel

Paul Renault

### Graduate students

### Recent alumni

Carlos González-Arciniegas

## Collaborators

Nicolas Menicucci (RMIT U. Melbourne)

Rafael Alexander (U. New Mexico)

Robert Edwards (Jefferson Laboratory)

Raúl Briceño (Old Dominion U.)

Kostas Orginos (College of William and Mary)

Paulo Nussenzveig (U. São Paulo)

Marcelo Martinelli (U. São Paulo)

Israel Klich (U. Virginia)

## Recent and notable publications

A. Anteneh and O. Pfister, Sample efficient graph classification using binary Gaussian boson sampling, arXiv:2301.01232 [quant-ph], submitted.

M. Eaton, A. Hossameldin, R.J. Birrittella, P.M. Alsing, Ch.C. Gerry, Ch.Cuevas, H. Dong, and O. Pfister, Resolution of 100 photons and quantum generation of unbiased random numbers, Nature Photonics 17, 106 (2023).

M. Eaton, C. González-Arciniegas, R.N. Alexander, N.C. Menicucci, and O. Pfister, Measurement-based generation and preservation of cat and grid states within a continuous-variable cluster state, Quantum 6, 769 (2022).

R. Nehra, M. Eaton, O. Pfister, A. Marandi, All-optical Quantum State Engineering for Rotation-symmetric Bosonic States, arXiv:2105.11035 [quant-ph], submitted.

Ch.C. Gerry, R.J. Birrittella, P.M. Alsing, A. Hossameldin, M. Eaton, O. Pfister, Proposal for a quantum random number generator using coherent light and a non-classical observable, Journal of the Optical Society of America B 39, 1068 (2022).

C. González-Arciniegas, P. Nussenzveig, M. Martinelli, and O. Pfister, Are all Gaussian states also cluster states? Essential diagnostic tools for continuous-variable one-way quantum computing, PRX Quantum 2, 030343 (2021).

Z. Yang, M. Jahanbozorgi, D. Jeong, S. Sun, O. Pfister, H. Lee, X. Yi, A squeezed quantum microcomb on a chip, Nature Communications 12, 4781 (2021).

R. Shahrokhshahi, A. Hossameldin, S. Guha, and O. Pfister, Fock state interferometry for quantum-enhanced phase discrimination, arXiv:2102.05772 [quant-ph], submitted.

R.F. Barros, G.B. Alves, O. Pfister, and A.Z. Khoury, Quantum-controlled cluster states, Physical Review A 104, 033713 (2021).

X. Zhu, C.-H. Chang, C. González-Arciniegas, A. Pe'er, J. Higgins, and O. Pfister, Hypercubic cluster states in the phase modulated quantum optical frequency comb, Optica 8, 281 (2021).

M. Eaton, R. Nehra, A. Win, and O. Pfister, Heisenberg-limited quantum interferometry with photon-subtracted twin beams, Physical Review A 103, 013726 (2021).

R. Nehra, M. Eaton, C. González-Arciniegas, M.S. Kim, Th. Gerrits, A. Lita, S.W. Nam, and O. Pfister, Generalized overlap quantum state tomography, Physical Review Research 2, 042002(R) (2020).

R. Yang, J. Zhang, I. Klich, C. González-Arciniegas, and O. Pfister, Spatiotemporal graph states from a single optical parametric oscillator, Physical Review A 101, 043832 (2020).

R. Nehra, C.-H. Chang, Q. Yu, A. Beling, and O. Pfister, Photon-number-resolving segmented detectors based on single-photon avalanche-photodiodes, Optics Express 28(3), 3660-3675 (2020) .

O. Pfister, Continuous-variable quantum computing in the quantum optical frequency comb, Journal of Physics B: Atomic, Molecular, and Optical Physics 53, 012001 (2020); invited topical review.

R. Nehra, A. Win, M. Eaton, N. Sridhar, R. Shahrokhshahi, Th. Gerrits, A. Lita, S. W. Nam, and O. Pfister, State-independent quantum tomography by photon-number-resolving measurements, Optica 6, 1356 (2019).

M. Eaton, R. Nehra, and O. Pfister, Non-Gaussian and Gottesman-Kitaev-Preskill state preparation by photon catalysis, New Journal of Physics 21, 113034 (2019).

J. Zang, Zh. Yang, X. Xie, M. Ren, Y. Shen, Z. Carson, O. Pfister, A. Beling, and J.C. Campbell, High quantum efficiency uni-traveling-carrier photodiode, IEEE Photonics Technology Letters 29, 302 (2017).

R. N. Alexander, P. Wang, N. Sridhar, M. Chen, O. Pfister, and N.C. Menicucci, One-way quantum computing with arbitrarily large time-frequency continuous-variable cluster states from a single optical parametric oscillator, Physical Review A 94, 032327 (2016).

N. Sridhar, R. Shahrokhshahi, A. J. Miller, B. Calkins, Th. Gerrits, A. Lita, S. W. Nam, and O. Pfister, Direct measurement of the Wigner function by photon-number-resolving detection, Journal of the Optical Society of America B 31, B34 (2014).

P. Wang, M. Chen, N.C. Menicucci, and O. Pfister, Weaving quantum optical frequency combs into hypercubic cluster states, Physical Review A 90, 032325 (2014).

M. Chen, N.C. Menicucci, and O. Pfister, Experimental realization of multipartite entanglement of 60 modes of a quantum optical frequency comb, Physical Review Letters 112, 120505 (2014).

N. Sridhar and O. Pfister, Generation of multipartite spin entanglement from multimode squeezed states, Physical Review A 89, 012310 (2014).

R. Evans and O. Pfister, On the experimental violation of Mermin's inequality with imperfect measurements, Quantum Information and Computation 11, 820 (2011).

M. Pysher, Y. Miwa, R. Shahrokhshahi, R. Bloomer, and O. Pfister, Parallel generation of quadripartite cluster entanglement in the optical frequency comb, Physical Review Letters 107, 030505 (2011).

R. Bloomer, M. Pysher, and O. Pfister, Nonlocal restoration of two-mode squeezing in the presence of strong optical loss, [VIDEO ABSTRACT] New Journal of Physics 13, 063014 (2011).

M. Pysher, Y. Miwa, R. Shahrokhshahi, D. Xie, and O. Pfister, A new method for locking the signal-field phase difference in a type-II optical parametric oscillator above threshold, Optics Express 18, 27858 (2010).

M. Pysher, A. Bahabad, P. Peng, A. Arie, and O. Pfister, Quasiphasematched concurrent nonlinearities in periodically poled KTiOPO4 for quantum computing over the optical frequency comb, Optics Letters 35, 565 (2010).

M. Pysher, R. Bloomer, C. M. Kaleva, T. D. Roberts, P. Battle, and O. Pfister, Broadband amplitude squeezing in a periodically poled KTiOPO4 waveguide, Optics Letters 34, 256 (2009).

S.T. Flammia, N.C. Menicucci, and O. Pfister, The optical frequency comb as a one-way quantum computer, Journal of Physics B 42, 114009 (2009).

N.C. Menicucci, S.T. Flammia, and O. Pfister, One-way quantum computing in the optical frequency comb, Physical Review Letters 101, 130501 (2008).

N.C. Menicucci, S.T. Flammia, H. Zaidi, and O. Pfister, Ultracompact generation of continuous-variable cluster states, Physical Review A 76, 010302(R) (2007).

D. Xie, M. Pysher, J. Jing, and O. Pfister, Enhanced optical communication and broadband sub-shot-noise interferometry with a stable free-running periodically-poled-KTiOPO4 squeezer, Journal of the Optical Society of America B 24, 2702 (2007).

J. Jing, S. Feng, R. Bloomer, O. Pfister, Experimental continuous-variable entanglement from a phase-difference-locked optical parametric oscillator, Physical Review A 74, 041804(R) (2006).

R. C. Pooser and O. Pfister, Observation of triply coincident nonlinearities in periodically poled KTiOPO4, Optics Letters 30, 2635 (2005).

O. Pfister, S. Feng, G. Jennings, R. Pooser, and D. Xie, Multipartite continuous-variable entanglement from concurrent nonlinearities, Physical Review A 70, 020302(R) (2004).

S. Feng and O. Pfister, Sub-shot-noise heterodyne polarimetry, Optics Letters 29, 2800 (2004).

S. Feng and O. Pfister, Quantum interference of ultrastable twin optical beams, Physical Review Letters 92, 203601 (2004).