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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.43: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II

Efficient and long-lived quantum memory with cold atoms inside a ring cavity — Xiao-Hui Bao^1,2, •Andreas Reingruber¹, Peter Dietrich¹, Jun Rui², Alexander Dück¹, Thorsten Strassel¹, Bo Zhao³, and Jian-Wei Pan^1,2 — ¹Physikalisches Institut der Universitaet Heidelberg, Philosophenweg 12, Heidelberg 69120, Germany — ²Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China — ³Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria

Quantum memories for photons are regarded as one of the fundamental building blocks of linear-optical quantum computation and long-distance quantum communication. A long standing goal in scalable quantum information processing is to build a long-lived and efficient quantum memory. There have been significant efforts distributed towards this direction. So far, efficient but short-lived or long-lived but inefficient quantum memories have been demonstrated. However, either a low efficiency or a short lifetime severely limits the scalability of any quantum information protocols. Here we report a high-performance quantum memory in which long lifetime and high retrieval efficiency meet for the first time. We present the realization of a quantum memory with an intrinsic spin wave to photon conversion efficiency of 73(2)% together with a storage lifetime of 3.2(1) ms. This realization provides an essential tool towards realistic scalable linear-optical quantum information processing.