Generation of nonclassical photon pairs for scalable quantum communication with atomic ensembles

By A. Kuzmich, Warwick P. Bowen, A. Boozer, A. Boca, C. Chou, Luming Duan, H. Jeff Kimble. Nature, 2003

573 citations recorded by the source corpus.

Quantum information science attempts to exploit capabilities from the quantum realm to accomplish tasks that are otherwise impossible in the classical domain. Although sufficient conditions have been formulated for the physical resources required to achieve quantum computation and communication, there is a growing understanding of the power of quantum measurement combined with the conditional evolution of quantum states for accomplishing diverse tasks in quantum information science. For example, a protocol has recently been developed for the realization of scalable long-distance quantum communication and the distribution of entanglement over quantum networks. Here we report the first enabling step in the realization of this protocol, namely the observation of quantum correlations for photon pairs generated in the collective emission from an atomic ensemble. The nonclassical character of the fields is demonstrated by the violation of an inequality involving their normalized correlation functions. Compared to previous investigations of non-classical correlations for photon pairs produced in atomic cascades and in parametric down-conversion, our experiment is distinct in that the correlated photons are separated by a programmable time interval (of about 400 nanoseconds in our initial experiments).

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/910a488fad8fdde08198f4dbb63320dd1a2aaec0

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Linear optical quantum computing with photonic qubits (2005, background): “Two-photon states without entanglement have been created experimentally by Moreau et al. (2001), and Santori et al. (2002a), as have entangled photon pairs (Yamamoto et al. 2003; Kuzmich et al. 2003).”
Quantum repeaters based on atomic ensembles and linear optics (2009, methodology): “More recently, (Chen et al., 2006) have achieved a value of gS,AS =100 with an improved version of the setup of (Kuzmich et al., 2003).”
Quantum matter built from nanoscopic lattices of atoms and photons (2018, background): “…(Fleischhauer and Lukin, 2000; Liu et al., 2001; Julsgaard et al., 2004; Choi et al., 2008), spin squeezing (Kuzmich, Mandel, and Bigelow, 2000), or probabilistic schemes for quantum information processing (Duan et al., 2001; Kuzmich et al., 2003; Chaneliere et al., 2005; Duan and Monroe, 2008).”
Colloquium: Quantum networks with trapped ions (2010, background): “The coherence ͑storage͒ time in atomic ensemble qubits is mainly limited by inhomogeneous magnetic fields throughout the atomic sample to the microsecond time scale ͑Kuzmich et al., 2003͒.”
Quantum memories: emerging applications and recent advances (2015, background): “th, long coherence times, and easily-accessible optical transitions in the near-infrared, alkali vapours have been used for some of the most important memory developments, ranging from early research [114,115], to the most recent achievements, to which we now turn. Orbital angular momentum storage i”
Electromagnetically induced transparency : Optics in coherent media (2005, background): “Kuzmich and co-workers Kuzmich et al., 2003 and independently van der Wal and collaborators van der Wal et al., 2003 have demonstrated quantum correlations between Stokes and anti-Stokes photons generated with a controllable time delay by resonant Raman scattering on atomic ensembles.”
Four-wave-mixing stopped light in hot atomic rubidium vapour (2009, methodology): “In the field of atomic memories, collective atomic effects have been used to store coherences of a spontaneously emitted Stokes photon and deterministically retrieve its correlated anti-Stokes twi”