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Poincaré sphere representation of polarization-squeezed light

Atomic Quantum Optics

Prof. Dr. Morgan Mitchell

    Activities:

We study quantum physics as it manifests in atomic and optical systems, especially quantum processes arising from light-atom interactions. One major area of research is atomic quantum sensors, for which we have developed hot-vapor, laser-cooled, and ultra-cold atomic systems. With these we have demonstrated entanglement-enhanced sensing of magnetic fields, and more generally are working to understand how entanglement and other quantum effects can improve quantum sensor technology. Another area of interest is fundamental quantum physics at the light-atom interface. For this we work with individual trapped atoms and ultracold atoms. Finally, we study quantum randomness and its relationship to technology and foundations of physics.

    Resources Available

    The group has three well-equipped, modern laboratories for quantum optics and cold atomic physics experiments. Notable technologies developed in the group include:

  • rubidium-resonant squeezed light and indistinguishable single photons,
  • ultra-narrow optical filters based on atomic media,
  • high optical depth cold atomic ensembles,
  • quantum non-demolition measurements of atomic spin,
  • spin-squeezed states of atomic ensembles,
  • atomic magnetometers operating beyond the shot-noise and projection-noise limits, and
  • ultra-fast quantum random number generators.

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Atomic Quantum Optics

Prof. Dr. Morgan Mitchell

    Former Group Members
  • José Gabriel Aguirre, Visiting scientist
  • Gabriele Anzolin, Postdoctoral researcher
  • Federica Beduini, PhD student
  • Naeimeh Behbood, PhD student
  • José Manuel Caballero, Visiting scientist
  • Alessandro Cerè, Postdoctoral researcher
  • Giorgio Colangelo, PhD student
  • Sebastián Rodrigo de Echaniz, Postdoctoral researcher
  • Yannick Alan De Icaza, PhD student
  • Ivan Howard Deutsch, Visiting profesorr
  • Brice Dubost, PhD student
  • Nicolas Godbout, Visiting scientist
  • Martijn Jasperse, Postdoctoral researcher
  • Ricardo Jiménez, Postdoctoral researcher
  • Marco Koschorreck, PhD student
  • Marcin Krzystof Kubasik, PhD student
  • Nan Li, Postdoctoral researcher
  • Vito Giovanni Lucivero, PhD student
  • Jeffrey Lundeen, Visiting scientist
  • Ferran Martin, PhD student
  • Natali Martínez, Research fellow
  • Mario Napolitano, PhD student
  • Silvana Palacios, PhD student
  • Valentina Parigi, Visiting scientist
  • Ana Predojevic, PhD student
  • Robert Sewell, Research fellow
  • Lukas Slodicka, Visiting scientist
  • Thomas Paul Louis Vanderbruggen, Postdoctoral researcher
  • Jayadev Vijayan, Visiting scientist
  • Chiara Vitelli, Visiting scientist
  • Florian Wolfgramm, PhD student
  • Xingxing Xing, Visiting scientist
  • Zehui Zhai, Postdoctoral researcher
  • Joanna Zielinska, PhD student

Atomic Quantum Optics

Prof. Dr. Morgan Mitchell

    Proceedings & Book
  • High sensitivity magnetometers R. Jiménez-Martínez, S. Knappe Microfabricated Optically-Pumped Magnetometers, 523-551 (Springer, 2017) Ed. by A. Grosz, M. J. Haji-Sheikh, S. C. Mukhopadhyay. Smart Sensors, Measurement and Instrumentation 19
  • Generation, characterization and use of atom-resonant indistinguishable photon pairs M. W. Mitchell Engineering the atom-Photon interaction, Springer, 2015
  • 100 MHz amplitude and polarization modulated optical source for free-space quantum communications at 850 nm M. Jofre, A. Gardelein, G. Anzolin, G. Molina-Terriza, J. P. Torres, M. W. Mitchell, V. Pruneri PSATA 2010, LNICST 43, 291-298 (2010)
    Invited Talks
  • Entangled photon- and faint laser pulse sources for applications in space F. Steinlechner, M. Jofre, W. Amaya, M. Mitchell, V. Pruneri Winter School in Quantum Communications (QSNOW2013), Asiago, Italy, February 2013
  • Compact entangled-pair and low-number-of-photon sources for quantum communication in space M. Jofre, F. Steinlechner, J. P. Torres, M. W. Mitchell, V. Pruneri Photonics North, Montreal, Canada, June 2012
  • Compact optical sources for quantum communications M. Jofre, F. Steinlechner, G. Anzolin, M. Curty, J. P. Torres, M. W. Mitchell, V. Pruneri 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2011), Barcelona, Spain, October 2011
  • Micro-optical sources for quantum communication in space M. Jofre, A. Gardelein, G. Anzolin, M. W. Mitchell, V. Pruneri European Optical Society Annual Meeting 2010, Paris, France, October 2010
  • Integrated quantum light sources for space M. Jofre, A. Gardelein, G. Anzolin, M. W. Mitchell, V. Pruneri Theory and Realisation of Practical Quantum Key Distribution 2010, Institute for Quantum Computing - University of Waterloo, Canada, June 2010
  • Quantum transceiver for secure global communications V. Pruneri, A. Gardelein, M. Jofre, G. Molina-Terriza, M. W. Mitchell, J. Pérez, E. Bernabéu, L. M. Sánchez-Brea, W. Amaya, J. Capmany, R. Using, T. Jennewein, L. Peñate, F. Gutiérrez, J. L. San Juan, J. Moreno Quantum Comm, Vico Equense, Sorrento peninsula, Italy, October 2009
    Talks
  • Toward an optically-integrated quantum random number generator C. Abellán, W. Amaya, M. W. Mitchell, V. Pruneri CLEO/Europe-EQEC 2015, Munich, Germany, June 2015
  • Ultra-bright source of polarization-entangled photons in a linear double-pass configuration F. Steinlechner, S. Ramelow, M. Jofre, M. Gilaberte, T. Jennewein, J. P. Torres, M. W. Mitchell, V. Pruneri CLEO/Europe-EQEC 2013, Munich, Germany, May 12-16, 2013
  • A high brightness source of polarization entangled photons for applications in free-space F. Steinlechner, P. Trojek, M. Jofre, H. Weier, E. Wille, J. M. Perdigues Armengol, R. Ursin, T. Jennewein, J. Rarity, M. W. Mitchell, J. P. Torres, H. Weinfurter, V. Pruneri ICSOS 2012: International Conference on Space Optical Systems and Applications, Ajaccio, France, October 9-12, 2012
  • Spin squeezing experiments in a cold ensemble of 87Rb M. Kubasik CLEO/Europe-IQEC Conference, Munich, Germany, June 21, 2007
  • Metrology with entangled states M. W. Mitchell SPIE Optics and Photonics 2005: Quantum Communications and Quantum Imaging, San Diego, USA, August 2005
  • Conditions for spin squeezing in a cold 87Rb ensemble S. R. de Echaniz, M. Kubasik, H. Crepaz, M. W. Mitchell, J. Eschner, E. S. Polzik 9th International Conference on Squeezed States and Uncertainty Relations, Besançon, France, May 2005
    Posters
  • A high-brightness source of polarization-entangled photons for applications in space F. Steinlechner, P. Trojek, M. Jofre, H. Weier, E. Wille, J. M. Perdigues Armengol, R. Ursin, T. Jennewein, J. Rarity, M. W. Mitchell, J. P. Torres, H. Weinfurter, V. Pruneri QCMC 2012: 11th International Conference on Quantum Communication, Measurement and Computing, Vienna, Austria, July-August 2012
  • Active and passive optical sources for QKD M. Jofre, F. Steinlechner, G. Anzolin, W. Amaya, J. Capmany, R. Ursin, J. L. Vilas, E. Bernabeu, J. P. Torres, M. Mitchell, V. Pruneri CLEO/Europe-EQEC 2011, Munich, Germany, May 22-26, 2011
  • Conditions for spin-squeezing in laser-cooled rubidium S. R. de Echaniz, M. W. Mitchell, M. Kubasik, M. Koschorreck, H. Crepaz, J. Eschner, E. S. Polzik CLEO/Europe-EQEC, Munich, Germany, June 2005
  • Conditions for spin-squeezing in laser-cooled rubidium S. R. de Echaniz, M. W. Mitchell, M. Kubasik, M. Koschorreck, H. Crepaz, J. Eschner, E. S. Polzik Quantum Physics of Nature & 6th European QIPC Workshop, Viena, Austria, May 2005
  • Spin squeezing in cold atomic ensembles M. Kubasik, S. de Echaniz, H. Crepaz, J. Eschner, E. S. Polzik Niels Bohr Summer Institute on Quantum Optics, Copenhagen, Denmark, August 2004
  • Towards quantum information processing with atomic ions in a penning trap S. R. de Echaniz, R. Hendricks, K. Koo, A. De Lange, E. S. Phillips, H. F. Powell, J. Sudbery, R. C. Thompson, D. M. Segal 4th European QIPC Workshop, Oxford, United Kingdom, July 2003
  • Intensity-dependent dispersion under conditions of electromagnetically induced transparency in coherently prepared multistate atoms A. D. Greentree, D. Richards, J. A. Vaccaro, A. V. Durrant, S. R. de Echaniz, D. M. Segal, J. P. Marangos CLEO/ Europe 2003- EQEC 2003, Munich, Germany, June 2003

Atomic Quantum Optics

Prof. Dr. Morgan Mitchell