Memory for Light as a Quantum Process
Abstract
We report complete characterization of an optical memory based on electromagnetically induced transparency. We recover the superoperator associated with the memory, under two different working conditions, by means of a quantum process tomography technique that involves storage of coherent states and their characterization upon retrieval. In this way, we can predict the quantum state retrieved from the memory for any input, for example, the squeezed vacuum or the Fock state. We employ the acquired superoperator to verify the nonclassicality benchmark for the storage of a Gaussian distributed set of coherent states.
- Publication:
-
Physical Review Letters
- Pub Date:
- May 2009
- DOI:
- 10.1103/PhysRevLett.102.203601
- arXiv:
- arXiv:0812.4053
- Bibcode:
- 2009PhRvL.102t3601L
- Keywords:
-
- 42.50.Ex;
- 03.67.-a;
- 32.80.Qk;
- 42.50.Dv;
- Optical implementations of quantum information processing and transfer;
- Quantum information;
- Coherent control of atomic interactions with photons;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Quantum Physics
- E-Print:
- Physical Review Letters 102, 203601 (2009)