Mainz 1997 – wissenschaftliches Programm

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Q: Quantenoptik

Q II: HV II

Q II.1: Hauptvortrag

Dienstag, 4. März 1997, 11:00–11:45, N 1

Quantum Measurement and Logic with Single Atoms and Photons — •H. J. Kimble — California Institute of Technology

The implementation of quantum logic suitable for computation and communication requires strong coupling between elemental quantum constituents, which then serve as the quantum bits (or "qubits"). Within the context of cavity quantum electrodynamics (CQED), strong coupling has been achieved for the radiative interaction of individual atoms with single quanta in the field of a high-finesse optical resonator. In one scheme for conditional quantum dynamics, "flying qubits" are composed of single-photon pulses with internal state specified by orthogonal polarizations and with strong coupling between the fields provided by interactions with an atom in an optical cavity [1]. Alternatively, by following the suggestion in Ref. 2, a collection of intracavity atoms can be employed as qubits, with "quantum wiring" provided by single photons in the intracavity field. By combining the virtues of internal atomic states for storage and processing of quantum information with photons for transport and distribution of quantum entanglement, it should be possible to form quantum networks for parallel quantum computing and communication [3]. All of these strategies present daunting theoretical and experimental challenges that are being addressed in our research program at Caltech, which is supported by DARPA through the Quantum Information and Computation (QUIC) Institute administered by ARO, by the National Science Foundation, and by the Office of Naval Research.

[1] Q. Turchette, C. J. Hood, H. Mabuchi, W. Lange, and H. J. Kimble, Phys. Rev. Lett. 75, 4710 (1995).

[2] T. Pellizzari, S. Gardiner, I. Cirac, and P. Zoller, Phys. Rev. Lett. 75, 3788 (1995).

[3] I. Cirac, P. Zoller, H. J. Kimble, and H. Mabuchi, Phys. Rev. Lett. (submitted, 1995).