Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.

January 13 , 2006
1:00 PM

Francesco DeMartini,
Universita' "La Sapienza" Roma, Italy

Realization of a Decoherence-free Mesoscopic Quantum Superposition

Abstract

We report the realization of an entangled quantum superposition of about 100 photons by multiple cloning of a single qubit via a high gain quantum-injected optical parametric oscillator. By quantum tomographic methods the conditions of non-separability and quantum superposition are investigated for the mesoscopic output state of a dynamic "closed system". Fringing patterns with large visibility of the quantum interference are obtained at room temperature. The system appear to fully realize the condition conceived in 1935 by Erwin Schroedinger by his paradigmatic "Cat" apologue, a fundamental quantum mechanical landmark.