Narrow-band frequency tunable light source of continuous quadrature entanglement
Abstract
We report the observation of nonclassical quantum correlations of continuous light variables from an altogether different type of source. It is a frequency nondegenerate optical parametric oscillator below threshold, where signal and idler fields are separated by 740 MHz corresponding to two free spectrum ranges of the parametric oscillator cavity. The degree of entanglement observed, -3.8 dB, is the highest to date for a narrow-band tunable source suitable for atomic quantum memory and other applications in atomic physics. Finally we use the latter to visualize the Einstein-Podolsky-Rosen paradox.
- Publication:
-
Physical Review A
- Pub Date:
- September 2002
- DOI:
- arXiv:
- arXiv:quant-ph/0205015
- Bibcode:
- 2002PhRvA..66c3802S
- Keywords:
-
- 42.50.Dv;
- 03.67.Hk;
- 42.65.Yj;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Quantum communication;
- Optical parametric oscillators and amplifiers;
- Quantum Physics
- E-Print:
- 11 pages, 9 figures, LaTeX