Reversible state transfer between light and a single trapped atom.

We demonstrate the reversible mapping of a coherent state of light with a mean photon number (-)n approximately equal to 1.1 to and from the hyperfine states of an atom trapped within the mode of a high-finesse optical cavity. The coherence of the basic processes is verified by mapping the atomic state back onto a field state in a way that depends on the phase of the original coherent state. Our experiment represents an important step toward the realization of cavity QED-based quantum networks, wherein coherent transfer of quantum states enables the distribution of quantum information across the network.

[1]  Kimble,et al.  Synthesis of arbitrary quantum states via adiabatic transfer of Zeeman coherence. , 1993, Physical review letters.

[2]  Bergmann,et al.  Adiabatic population transfer in a three-level system driven by delayed laser pulses. , 1989, Physical review. A, General physics.

[3]  Nikolay V. Vitanov,et al.  Coherent Manipulation of Atoms Molecules By Sequential Laser Pulses , 2001 .

[4]  A. D. Boozer,et al.  Cooling to the ground state of axial motion for one atom strongly coupled to an optical cavity. , 2006, Physical review letters.

[5]  H. J. Kimble,et al.  Cavity QED and quantum-information processing with "hot" trapped atoms , 2003 .

[6]  Wolfgang Dür,et al.  Quantum Repeaters: The Role of Imperfect Local Operations in Quantum Communication , 1998 .

[7]  S. Lloyd,et al.  Quantum-Enhanced Measurements: Beating the Standard Quantum Limit , 2004, Science.

[8]  C. H. Bennett,et al.  Quantum Information and Computation , 1995 .

[9]  Ekert,et al.  Quantum cryptography based on Bell's theorem. , 1991, Physical review letters.

[10]  A. D. Boozer,et al.  Deterministic Generation of Single Photons from One Atom Trapped in a Cavity , 2004, Science.

[11]  H. Kimble,et al.  Scalable photonic quantum computation through cavity-assisted interactions. , 2004, Physical review letters.

[12]  J. Eberly,et al.  Adiabatic following in multilevel systems , 1984 .

[13]  S. Massar,et al.  Quantum information processing and communication , 2005 .

[14]  S Benjamin.  QUANTUM CRYPTOGRAPHY: Single Photons. , 2000, Science.

[15]  Herbert Walther,et al.  Continuous generation of single photons with controlled waveform in an ion-trap cavity system , 2004, Nature.

[16]  A. D. Boozer,et al.  Trapped atoms in cavity QED: coupling quantized light and matter , 2005 .

[17]  G. Rempe,et al.  Measurement of ultralow losses in an optical interferometer. , 1992, Optics letters.

[18]  Jun Ye,et al.  Characterization of high-finesse mirrors: Loss, phase shifts, and mode structure in an optical cavity , 2001, quant-ph/0101103.

[19]  H J Kimble,et al.  State-insensitive cooling and trapping of single atoms in an optical cavity. , 2003, Physical review letters.

[20]  J. Roch,et al.  Photon statistics characterization of a single-photon source , 2003, quant-ph/0312084.

[21]  J. Cirac,et al.  Quantum State Transfer and Entanglement Distribution among Distant Nodes in a Quantum Network , 1996, quant-ph/9611017.