# Quantum Fields and Quantum Information

Welcome to Pfister Labs!

## News

**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

### Graduate students

### Recent alumni

## Collaborators

Nicolas Menicucci (RMIT U. Melbourne)

Rafael Alexander (U. New Mexico)

Paulo Nussenzveig (U. São Paulo)

Marcelo Martinelli (U. São Paulo)

Israel Klich (U. Virginia)

## Recent and notable publications

R. Nehra, M. Eaton, O. Pfister, A. Marandi,

, arXiv:2105.11035 [quant-ph], submitted.**All-optical Quantum State Engineering for Rotation-symmetric Bosonic States**

Z. Yang, M. Jahanbozorgi, D. Jeong, S. Sun, O. Pfister, H. Lee, X. Yi,

, arXiv:2103.03380 [quant-ph], submitted.**A squeezed quantum microcomb on a chip**

R. Shahrokhshahi, S. Guha, and O. Pfister,

, arXiv:2102.05772 [quant-ph], submitted.**Fock state interferometry for quantum-enhanced phase discrimination**

C. González-Arciniegas, P. Nussenzveig, M. Martinelli, and O. Pfister,

, arXiv:1912.06463 [quant-ph], submitted.**Are all Gaussian states also cluster states? Detecting hidden continuous-variable entanglement**

R.F. Barros, G.B. Alves, O. Pfister, and A.Z. Khoury,

, arXiv:2012.15304 [quant-ph], submitted.**Quantum-controlled cluster states**

X. Zhu, C.-H. Chang, C. González-Arciniegas, A. Pe'er, J. Higgins, and O. Pfister,

, Optica**Hypercubic cluster states in the phase modulated quantum optical frequency comb****8**, 281 (2021).

M. Eaton, R. Nehra, A. Win, and O. Pfister,

, Physical Review A**Heisenberg-limited quantum interferometry with photon-subtracted twin beams****103**, 013726 (2021).

R. Nehra, M. Eaton, C. González-Arciniegas, M.S. Kim, Th. Gerrits, A. Lita, S.W. Nam, and O. Pfister,

, Physical Review Research,**Generalized overlap quantum state tomography****2**, 042002(R) (2020).

R. Yang, J. Zhang, I. Klich, C. González-Arciniegas, and O. Pfister,

, Physical Review A,**Spatiotemporal graph states from a single optical parametric oscillator****101**,

R. Nehra, C.-H. Chang, Q. Yu, A. Beling, and O. Pfister,

, Optics Express**Photon-number-resolving segmented detectors based on single-photon avalanche-photodiodes****28**(3), 3660-3675 (2020) .

O. Pfister,

, Journal of Physics B: Atomic, Molecular, and Optical Physics**Continuous-variable quantum computing in the quantum optical frequency comb****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,

, Optica**State-independent quantum tomography by photon-number-resolving measurements****6**, 1356 (2019).

M. Eaton, R. Nehra, and O. Pfister,

, New Journal of Physics**Non-Gaussian and Gottesman-Kitaev-Preskill state preparation by photon catalysis****21**, 113034 (2019).

J. Zang, Zh. Yang, X. Xie, M. Ren, Y. Shen, Z. Carson, O. Pfister, A. Beling, and J.C. Campbell,

, IEEE Photonics Technology Letters**High quantum efficiency uni-traveling-carrier photodiode****29**, 302 (2017).

R. N. Alexander, P. Wang, N. Sridhar, M. Chen, O. Pfister, and N.C. Menicucci,

, Physical Review A**One-way quantum computing with arbitrarily large time-frequency continuous-variable cluster states from a single optical parametric oscillator****94**, 032327 (2016).

N. Sridhar, R. Shahrokhshahi, A. J. Miller, B. Calkins, Th. Gerrits, A. Lita, S. W. Nam, and O. Pfister,

, Journal of the Optical Society of America B**Direct measurement of the Wigner function by photon-number-resolving detection****31**, B34 (2014).

P. Wang, M. Chen, N.C. Menicucci, and O. Pfister,

, Physical Review A**Weaving quantum optical frequency combs into hypercubic cluster states****90**, 032325 (2014).

M. Chen, N.C. Menicucci, and O. Pfister,

, Physical Review Letters**Experimental realization of multipartite entanglement of 60 modes of a quantum optical frequency comb****112**, 120505 (2014).

N. Sridhar and O. Pfister,

, Physical Review A**Generation of multipartite spin entanglement from multimode squeezed states****89**, 012310 (2014).

R. Evans and O. Pfister,

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

M. Pysher, Y. Miwa, R. Shahrokhshahi, R. Bloomer, and O. Pfister,

, Physical Review Letters**Parallel generation of quadripartite cluster entanglement in the optical frequency comb****107**, 030505 (2011).

R. Bloomer, M. Pysher, and O. Pfister,

, [VIDEO ABSTRACT] New Journal of Physics**Nonlocal restoration of two-mode squeezing in the presence of strong optical loss****13**, 063014 (2011).

M. Pysher, Y. Miwa, R. Shahrokhshahi, D. Xie, and O. Pfister,

, Optics Express**A new method for locking the signal-field phase difference in a type-II optical parametric oscillator above threshold****18**, 27858 (2010).

M. Pysher, A. Bahabad, P. Peng, A. Arie, and O. Pfister,

, Optics Letters**Quasiphasematched concurrent nonlinearities in periodically poled KTiOPO4 for quantum computing over the optical frequency comb****35**, 565 (2010).

M. Pysher, R. Bloomer, C. M. Kaleva, T. D. Roberts, P. Battle, and O. Pfister,

, Optics Letters**Broadband amplitude squeezing in a periodically poled KTiOPO4 waveguide****34**, 256 (2009).

S.T. Flammia, N.C. Menicucci, and O. Pfister,

, Journal of Physics B**The optical frequency comb as a one-way quantum computer****42**, 114009 (2009).

N.C. Menicucci, S.T. Flammia, and O. Pfister,

, Physical Review Letters**One-way quantum computing in the optical frequency comb****101**, 130501 (2008).

N.C. Menicucci, S.T. Flammia, H. Zaidi, and O. Pfister,

, Physical Review A**Ultracompact generation of continuous-variable cluster states****76**, 010302(R) (2007).

D. Xie, M. Pysher, J. Jing, and O. Pfister,

, Journal of the Optical Society of America B**Enhanced optical communication and broadband sub-shot-noise interferometry with a stable free-running periodically-poled-KTiOPO4 squeezer****24**, 2702 (2007).

J. Jing, S. Feng, R. Bloomer, O. Pfister,

, Physical Review A**Experimental continuous-variable entanglement from a phase-difference-locked optical parametric oscillator****74**, 041804(R) (2006).

R. C. Pooser and O. Pfister,

, Optics Letters**Observation of triply coincident nonlinearities in periodically poled KTiOPO4****30**, 2635 (2005).

O. Pfister, S. Feng, G. Jennings, R. Pooser, and D. Xie,

, Physical Review A**Multipartite continuous-variable entanglement from concurrent nonlinearities****70**, 020302(R) (2004).

S. Feng and O. Pfister,

, Optics Letters**Sub-shot-noise heterodyne polarimetry****29**, 2800 (2004).

S. Feng and O. Pfister,

, Physical Review Letters**Quantum interference of ultrastable twin optical beams****92**, 203601 (2004).