Many-Body Cavity QED

Many-Body Cavity QED

What is a quantum neural network and how might it exhibit computational advantage? Can we create a spin glass made of atomic spins and photons and use it to resolve longstanding mysteries surrounding spin-glass order? Could BEC matter waves interacting via photons mimic the quantum liquid crystals found in high-Tc superconductors? If so, what might we learn? We are tackling these fundamental and technologically relevant questions using our novel multimode cavity QED-BEC apparatus. The system provides strong, photon-mediated interactions among atoms trapped within the cavity resonator.  Photons virtually scattered among the atoms cause the system to superradiate and self-organize into various exotic forms of quantum matter such as quantum spin glasses---which can be used as quantum neural networks---and quantum liquid crystals. We have recently demonstrated the necessary ingredients needed to realize these exotic systems. Moreover, we are investigating whether quantum neural networks based on these driven-dissipative quantum systems may provide for finding solutions to NP-hard optimization problems.

News

Gouy-induced interaction

Two papers, here and here, show how Gouy phases modify... Read More

spinor polariton condensate from LevLab

We made a spinor polariton condensate.  Published in PRL. Read more... Read More

Tunable cavity interactions PRX

PRX paper published.  Results demostrate tunable range, photon-... Read More

Proposal for creating Meissner-like effect in multimode cavity QED.


Turtle mode

A new nonequilibrium state of matter.  To appear in Phys Rev Applied.  ArXiv version 


Dr. Alicia Kollar

Congratulations Alicia Kollár, PhD!


Dr. Alexander Pagageorge

Congratuations to Alexander Pagageorge, PhD!
Thesis


DMD

Digital Micromirror Devices (DMD) provide a robust platform with which to implement digital holography, in principle providing the means to... Read More

multimode

We present a novel cavity QED system in which a Bose-Einstein condensate (... Read More

Paper on neural network in multimode cavity.  Special... Read More

Spin glass and Hopefield neural network in multimode cQED paper appears in PRL.  ... Read More

Theory paper on soft quantum matter in multimode cavity QED published in Phys. Rev. A... Read More

Publications

Y. Guo, R. M. Kroeze, V. D. Vaidya, J. Keeling, and B. L. Lev
Sign-changing photon-mediated atom interactions in multimode cavity QED
arXiv:1810.11086  pdf

Y. Guo, V. D. Vaidya, R. M. Kroeze, R. A. Lunney, B. L. Lev, and J. Keeling
Emergent and broken symmetries of atomic self-organization arising from Gouy phase shifts in multimode cavity QED
arXiv:1810.11085  pdf

R. M. Kroeze, Y. Guo, V. D. Vaidya, J. Keeling, and B. L. Lev
Spinor self-ordering of a quantum gas in a cavity
Physical Review Letters 121, 163601 (2018). 
arXiv:1807.04915  pdf 

V. D. Vaidya, Y. Guo, R. M. Kroeze, K. E. Ballantine, A. J. Kollár, J. Keeling, and B. L. Lev
Tunable-range, photon-mediated atomic interactions in multimode cavity QED​
Physical Review X 8, 011002 (2018).  pdf
Selected for a Viewpoint in APS Physics:
H. Türeci, 
A Multimode Dial for Interatomic Interactions, pdf
arXiv:1708.08933

A. J. Kollár, A. T. Papageorge, V. D. Vaidya, Y. Guo, J. Keeling, and B. L. Lev
Supermode-density-wave-polariton condensation
Nature Communications 8, 14386 (2017). pdf
arXiv:1606.04127

K. E. Ballantine, B. L. Lev, and J. Keeling
Meissner-like effect for synthetic gauge field in multimode cavity QED​
Physical Review Letters 118, 045302 (2017).  pdf
arXiv:1608.07246 

A. T. Papageorge, A. J. Kollár, and B. L. Lev
Coupling to Modes of a Near-Confocal Optical Resonator Using a Digital Light Modulator
Optics Express 24, 11447 (2016). pdf
arXiv:1603.06900

A. Kollár, A. Papageorge, K. Baumann, M. Armen, and B. L. Lev
An adjustable-length cavity and Bose-Einstein condensate apparatus for multimode cavity QED 
New Journal of Physics 17, 043012 (2015). pdf
arXiv:1411.5443

S. Gopalakrishnan, B. L. Lev, and P. Goldbart
Frustration and glassiness in spin models with cavity-mediated interactions
Physical Review Letters 107, 277201 (2011). pdf

S. Gopalakrishnan, B. L. Lev, and P. Goldbart
Exploring models of associative memory via cavity quantum electrodynamics
Philosophical Magazine, 92, 353 (2012).
Special issue in honor of David Sherrington

S. Gopalakrishnan, B. L. Lev, and P. Goldbart
Atom-light crystallization of BECs in multimode cavities: Nonequilibrium classical and quantum phase transitions, emergent lattices, supersolidity, and frustration
Physical Review A 82, 043612 (2010). pdf
Selected for a Viewpoint in APS Physics

S. Gopalakrishnan, B. L. Lev, and P. Goldbart
Emergent crystallinity and frustration with Bose-Einstein condensates in multimode cavities
Nature Physics 5, 845 - 850 (2009).
Nature Physics News and Views article by Helmut Ritsch.
arXiv:cond-mat/0903.2254 pdf

Homepage Project Description: 

Quantum neural networks, quantum spin glasses, and quantum liquid crystals are studied using photon-mediated interactions provided by our novel multimode cavity QED-BEC system.

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