Gradient echo memory in an ultra-high optical depth cold atomic ensemble

Autor: B M Sparkes, J Bernu, M Hosseini, J Geng, Q Glorieux, P A Altin, P K Lam, N P Robins, B C Buchler

Publikováno v: New Journal of Physics, Vol 15, Iss 8, p 085027 (2013)

Quantum memories are an integral component of quantum repeaters—devices that will allow the extension of quantum key distribution to communication ranges beyond that permissible by passive transmission. A quantum memory for this application needs t

Externí odkaz: https://doaj.org/article/b5f102ce450e4d9a9a0603a3f22b6f6a

Building a quantum repeater with quantum memories and noiseless amplifiers

Autor: J. Bernu, Thomas Symul, Syed M. Assad, Ping Koy Lam, Benjamin Sparkes, S. Rebic, Jason Twamley, Helen M. Chrzanowski, Ben C. Buchler, Timothy C. Ralph, Geoff Campbell, Nathan Walk, Mahdi Hosseini, Olivier Pinel

Publikováno v: 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR).

We present a quantum repeater scheme that uses gradient echo memory and probabilistic noiseless amplification. We show that a quantum memory can process quantum information and a noiseless amplifier can distill entanglement.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::813315bab080836d4f6fdabea6f15773
https://doi.org/10.1109/cleopr.2013.6599943

Schrödinger kitten and cat states characterisation using only continuous variables and Gaussian resources

Autor: Thomas Symul, Helen M. Chrzanowski, Boris Hage, Timothy C. Ralph, J. Bernu, Austin P. Lund, Ping Koy Lam

Publikováno v: 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC).

Quantum optics used to be clearly divided into two camps: continuous variables and discrete variables. Continuous variable experiments measured the quadrature variables of the optical field at side band frequencies using frequency resolved homodyne d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::747382f751d50478d9c97cf48d212dd3
https://doi.org/10.1109/cleoe.2011.5943387

Photon number discrimination without a photon counter and reconstructing non-Gaussian states of light

Autor: Thomas Symul, Helen M. Chrzanowski, Austin P. Lund, Boris Hage, Ping Koy Lam, Benjamin Sparkes, J. Bernu, Timothy C. Ralph

Publikováno v: Scopus-Elsevier

We demonstrate a new approach to photon number discrimination, relying only on continuous variable homodyne measurements. We apply this technique to the reconstruction of the non-Gaussian one, two and three photon subtracted squeezed vacuum state. Th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01aa4ffa7759de0ad0bd43b925fbc491
https://doi.org/10.1364/iqec.2011.i759

The quantum Zeno effect and quantum feedback in cavity QED

Autor: J. Bernu, Pierre Rouchon, Igor Dotsenko, C. Sayrin, Jean-Michel Raimond, Michel Brune, Samuel Deléglise, Serge Haroche, Mazyar Mirrahimi

Publikováno v: Physica Scripta
Physica Scripta, IOP Publishing, 2010, 2010 (T140), pp.014004. ⟨10.1088/0031-8949/2010/T140/014004⟩
Physica Scripta, 2010, 2010 (T140), pp.014004. ⟨10.1088/0031-8949/2010/T140/014004⟩

International audience; We explore experimentally the fundamental projective properties of a quantum measurement and their application in the control of a system's evolution. We perform quantum non-demolition (QND) photon counting on a microwave fiel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3296e8d9069ff085f0eab09ee34bf85e
https://hal-mines-paristech.archives-ouvertes.fr/hal-00540014