Storage of Single Photons in Atomic Vapor I

In this proposal we exploit the potential of long-living coherent spin-excitations in hot atomic vapor as a storage medium for photonic quantum states. This idea may lead to an interface between quantum information encoded in stationary (atomic) and flying (photonic) qubits. By use of electromagnetically induced transparency, ¹³³Cs vapor looses its opaqueness for a particular electronic transition, accompanied by a steep slope in the index of refraction. Single photons, emitted on this transition, will be slowed down to group velocities of a few hundred meters per second. These photons can either be generated by a source for single photons based on quantum dot emission existing in our lab or by narrow-band parametric down-conversion.

In the field of quantum information, the fundamental interest in single photon storage is stimulated by theoretical research on quantum repeaters that may help to increase the communication range of fiber-based quantum cryptographic systems limited to about 100 km today. Other applications of this storage device cover entanglement transfer from photons to collective atomic states, shape control of photon wave packets, and experiments in non-linear optics.

Principal Investigators
Benson, Oliver Prof. Dr. rer. nat. (Details) (Experimental Physics / Nanooptics)

Duration of Project
Start date: 07/2005
End date: 06/2007

Last updated on 2020-09-03 at 23:09