Abstract
In a fibre-based quantum information network, telecom-wavelength transmission between quantum memory elements is required to minimize absorption. Owing to the paucity of suitable ground-state atomic transitions, a quantum memory interfaced with telecom light has not been previously realized. We report its demonstration by converting to telecom wavelength near-infrared light emitted on a ground-state transition. The conversion is achieved with a diamond configuration of atomic transitions, in an optically thick gas of cold rubidium. The quantum memory is also realized with cold rubidium, but confined in an optical lattice to suppress motional dephasing on a submillisecond timescale. We observe quantum memory lifetimes in excess of 0.1 s by laser compensation of the lattice light shifts that limited the previous generation of atomic memory to 7 ms. By measuring quantum correlations of light fields before and after telecom down-conversion, transmission and up-conversion, we demonstrate a basic memory element for a scalable, long-distance quantum network.
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References
Briegel, H-J., Duer, W., Cirac, J. I. & Zoller, P. Quantum repeaters: The role of imperfect local operations in quantum communication. Phys. Rev. Lett. 81, 5932–5935 (1998).
Duan, L-M., Lukin, M., Cirac, J. I. & Zoller, P. Long-distance quantum communication with atomic ensembles and linear optics. Nature 414, 413–418 (2001).
Chaneliere, T. et al. Quantum telecommunication based on atomic cascade transitions. Phys. Rev. Lett. 96, 093604 (2006).
Zhao, R. et al. Long-lived quantum memory. Nature Phys. 5, 100–104 (2009).
Dudin, Y. O. et al. Entanglement of a photon and an optical lattice spin-wave. Phys. Rev. Lett. 103, 020505 (2009).
Kuzmich, A. et al. Generation of nonclassical photon pairs for scalable quantum communication with atomic ensembles. Nature 423, 731–734 (2003).
van der Wal, C. H. et al. Atomic memory for correlated photon states. Science 301, 196–200 (2003).
Matsukevich, D. N. & Kuzmich, A. Quantum state transfer between matter and light. Science 306, 663–666 (2004).
Matsukevich, D. N. et al. Observation of dark-state polariton collapses and revivals. Phys. Rev. Lett. 96, 033601 (2006).
Matsukevich, D. N. et al. Entanglement of remote atomic qubits. Phys. Rev. Lett. 96, 030405 (2006).
Chen, Y. A. et al. Memory-built-in quantum teleportation with photonic and atomic qubits. Nature Phys. 4, 103–107 (2007).
Simon, J., Tanji, H., Ghosh, S. & Vuletic, V. Single-photon bus connecting spin-wave quantum memories. Nature Phys. 3, 765–769 (2007).
Laurat, J. et al. Heralded entanglement between atomic ensembles: Preparation, decoherence, and scaling. Phys. Rev. Lett. 99, 180504 (2007).
Matsukevich, D. N., Maunz, P., Moehring, D. L., Olmschenk, S. & Monroe, C. Bell inequality violation with two remote atomic qubits. Phys. Rev. Lett. 100, 150404 (2008).
McClelland, J. J. & Hanssen, J. L. Laser cooling without repumping: A magneto-optical trap for erbium atoms. Phys. Rev. Lett. 96, 143005 (2006).
Lu, M., Youn, S-H. & Lev, B. Trapping ultracold dysprosium: A highly magnetic gas for dipolar physics. Phys. Rev. Lett. 104, 063001 (2010).
Lauritzen, B. et al. Telecommunication-wavelength solid-state memory at the single photon level. Phys. Rev. Lett. 104, 080502 (2010).
Ashby, N. et al. Testing local position invariance with four cesium-fountain primary frequency standards and four NIST hydrogen masers. Phys. Rev. Lett. 98, 070802 (2007).
Jessen, P. S. & Deutsch, I. H. Optical lattices. Adv. At. Mol. Opt. Phys. 37, 95–136 (1996).
Yavuz, D. D. et al. Fast ground state manipulation of neutral atoms in microscopic optical traps. Phys. Rev. Lett. 96, 063001 (2006).
Kruse, J., Gierl, C., Schlosser, M. & Birkl, G. Reconfigurable site-selective manipulation of atomic quantum systems in two-dimensional arrays of dipole traps. Phys. Rev. A 81, 060308 (2010).
Kuhr, S. et al. Analysis of dephasing mechanisms in a standing-wave dipole trap. Phys. Rev. A 72, 023406 (2005).
Schnorrberger, U. et al. Electromagnetically induced transparency and light storage in an atomic Mott insulator. Phys. Rev. Lett. 103, 033003 (2009).
Willis, R. T. et al. Four-wave mixing in the diamond configuration in an atomic vapour. Phys. Rev. A 79, 033814 (2009).
Kaplan, A., Andersen, M. K. & Davidson, N. Suppression of inhomogeneous broadening in rf spectroscopy of optically trapped atoms. Phys. Rev. A 66, 045401 (2002).
Grangier, P., Roger, G. & Aspect, A. Experimental evidence for a photon anticorrelation effect on a beam splitter: A new light on single-photon interferences. Europhys. Lett. 1, 173–179 (1986).
Walls, D. F. & Milburn, G. J. Quantum Optics (Springer-Verlag, 1994).
Lin, Y-W. et al. Using a pair of rectangular coils in the MOT for the production of cold atom clouds with large optical density. Opt. Express 16, 3753–3761 (2008).
Ketterle, W., Davis, K. B., Joffe, M. A. & Pritchard, D. E. High densities of cold atoms in a dark spontaneous-force optical trap. Phys. Rev. Lett. 70, 2253–2256 (1993).
Acknowledgements
We thank D. N. Matsukevich for his contributions, and J. Blumoff and A. Marchenkova for experimental assistance. This work was supported by the Air Force Office of Scientific Research, the Office of Naval Research and the National Science Foundation.
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A.G.R., Y.O.D. and R.Z. designed and carried out the experiments and analysed the data, S.D.J. and H.H.J. carried out theoretical analysis, S.D.J. and A.G.R. wrote the Supplementary Information and A.K. and T.A.B.K. supervised the project and edited the manuscript.
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Radnaev, A., Dudin, Y., Zhao, R. et al. A quantum memory with telecom-wavelength conversion. Nature Phys 6, 894–899 (2010). https://doi.org/10.1038/nphys1773
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DOI: https://doi.org/10.1038/nphys1773
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