Quantop > Quantum Optics Lab > Research > Non-Classical Light
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Below we will give a short description of the project. For more information on the experiment choose one of the links in the menu-box below. |
Brief introduction to the experiment
The OPA illuminated by the beautiful blue light created by frequency doubling of ~860 nm light.
The aim of this experiment is to produce two frequency tunable EPR-entangled beams of light. The primary toy needed for this is the frequency non- degenerate optical parametric amplifier (OPA) operating below threshold.
History of the experiment
The experiment has been operating for many years in Århus and was the foundation of the Ph.D-theses of both Jens Lykke Sørensen and Christian Schori, but the EPR correlations were first observed in August 2001. By mid-2002 the experiment was temporarily abandoned.
The EPR-correlated light is reported in the following paper:
- Christian Schori, Jens L. Sørensen, and Eugene S. Polzik,
Narrow-band frequency tunable light source of continuous quadrature entanglement,
Phys. Rev. A 66, 033802 (2002).
During the move from Århus to Copenhagen most optical elements were moved together with the optical table, so the reviving of the setup amounts to fine-tuning of mirrors etc. and installation of the electronics. In september 2003, Jonas Neergaard started this reviving as part of his master's project.
Jonas working on the optical table.
[click picture to see larger version]
One of the goals of this project is to create a single-photon source possessing the same properties as the EPR light had, i.e. narrow-band and frequency tunable. This will make it very suitable for interaction with the cesium atoms of the other experiments in the group.
Intermediate steps on the road to single photons will be other non-classical states of light; squeezed and EPR-correlated. These states can also be used in conjunction with the atomic experiments for quantum information processing.