Quantum interference of a single spin excitation with a macroscopic atomic ensemble
| Autor: | Jörg H. Müller, S. L. Christensen, E. Bookjans, J.-B. Béguin, Jürgen Appel, Eugene S. Polzik, H. L. Sørensen |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Quantum nondemolition measurement Quantum Physics Photon Spin states Spin polarization Atomic Physics (physics.atom-ph) FOS: Physical sciences Order (ring theory) Atomic and Molecular Physics and Optics Physics - Atomic Physics Fock state Excited state Quantum mechanics Condensed Matter::Strongly Correlated Electrons Physics::Atomic Physics Atomic physics Quantum Physics (quant-ph) Spin-½ |
| Zdroj: | Physical Review A |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.89.033801 |
| Popis: | We report on the observation of quantum interference of a collective single spin excitation with a spin ensemble of $N_{\text{atom}} =10^5$ atoms. Detection of a single photon scattered from the atoms creates the single spin excitation, a Fock state embedded in the collective spin of the ensemble. The state of the atomic ensemble is then detected by tomography via a quantum non-demolition measurement of the collective spin. A macroscopic difference of the order of $\sqrt{N_{\text{atom}}}$ in the marginal distribution of the collective spin state arises from the interference between the single excited spin and $N_{\text{atom}}$ atoms. The hybrid discrete-continuous processing of the collective spin pave the road towards generation of even more exotic states for quantum information processing, precision measurements and communication. Published version |
| Databáze: | OpenAIRE |
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