MACROSCOPIC QUANTUM ENTANGLEMENT IN LIGHT REFLECTION FROM BOSE-EINSTEIN CONDENSATES

The present work investigates quantum phenomena with large size systems generated in the microscopic world and then transferred in the macro one through an amplification process. Precisely, a microscopic entangled photon state is created by a nonlinear optical process, then one subsystem is injected into an optical parametric amplifier and then converted into a macro — state consisting of N ≈ 3.5 × 104 photons in a quantum superposition. By adopting a local filtering technique, we then demonstrate the entanglement of the bipartite system. The new conceptual framework paves the way toward the generation of light-matter entangled states by coupling the output radiation with a Bose-Einstein condensate. The multiphoton superposition generated by a quantum-injected optical parametric amplifier (QI-OPA) can be made to interact with a Mirror-BEC shaped as a Bragg interference structure.

[1]  Matteo G. A. Paris,et al.  Robust generation of entanglement in Bose-Einstein condensates by collective atomic recoil , 2004, quant-ph/0404109.

[2]  W. Schleich.  Quantum Optics in Phase Space: SCHLEICH:QUANTUM OPTICS O-BK , 2005 .

[3]  F Minardi,et al.  Expansion of a coherent array of Bose-Einstein condensates. , 2001, Physical review letters.

[4]  Fabio Sciarrino,et al.  Experimental macroscopic coherence by phase-covariant cloning of a single photon , 2007 .

[5]  Fabio Sciarrino,et al.  Realization of an optimally distinguishable multiphoton quantum superposition. , 2005, Physical review letters.

[6]  F. Sciarrino,et al.  Contextual realization of the universal quantum cloning machine and of the universal-NOT gate by quantum-injected optical parametric amplification , 2003, quant-ph/0302087.

[7]  Fabio Sciarrino,et al.  Non-linear parametric processes in quantum information , 2005 .

[8]  F. Sciarrino,et al.  Experimental realization of the quantum universal NOT gate , 2002, Nature.

[9]  S. Deleglise,et al.  Progressive field-state collapse and quantum non-demolition photon counting , 2007, Nature.

[10]  M. Oberthaler,et al.  Dynamics of Bose-Einstein condensates in optical lattices , 2006 .

[11]  D Bouwmeester,et al.  Quantum entanglement of a large number of photons. , 2004, Physical review letters.

[12]  Fabio Sciarrino,et al.  Experimental test of the no-signaling theorem. , 2007, Physical review letters.

[13]  Francesco De Martini.  Amplification of Quantum Entanglement , 1998 .