Long-distance atom-photon entanglement
arXiv:0808.3538 · doi:10.1103/PhysRevLett.101.260403
Abstract
We report the observation of entanglement between a single trapped atom and a single photon at remote locations. The degree of coherence of the entangled atom-photon pair is verified via appropriate local correlation measurements, after communicating the photon via an optical fiber link of 300 m length. In addition we measured the temporal evolution of the atomic density matrix after projecting the atom via a state measurement of the photon onto several well defined spin states. We find that the state of the single atom dephases on a timescale of 150 s, which represents an important step toward long-distance quantum networking with individual neutral atoms.
4 pages, 4 figures
References in corpus (11)
- Quantum teleportation between light and matter
- Experimental demonstration of quantum memory for light
- Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
- Bell inequality violation with two remote atomic qubits
- Reversible state transfer between light and a single trapped atom
- Multiplexed Memory-Insensitive Quantum Repeaters
- Memory-built-in quantum teleportation with photonic and atomic qubits
- Remote preparation of an atomic quantum memory
- Coherence properties and quantum state transportation in an optical conveyor belt
- Fast Quantum State Control of a Single Trapped Neutral Atom
- Direct measurement of decoherence for entanglement between a photon and stored atomic excitation