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Failure of Local Realism Revealed by Extremely-Coarse-Grained Measurements
Jeong, Hyunseok,Paternostro, Mauro,Ralph, Timothy C. American Physical Society 2009 Physical Review Letters Vol.102 No.6
<P>We show that failure of local realism can be revealed to observers for whom only extremely-coarse-grained measurements are available. In our instances, Bell's inequality is violated even up to the maximum limit while both the local measurements and the initial local states under scrutiny approach the classical limit. Furthermore, we can observe failure of local realism when an inequality enforced by nonlocal realistic theories is satisfied. This suggests that locality alone may be violated while realism cannot be excluded for specific observables and states. Small-scale experimental demonstration of our examples may be possible in the foreseeable future.</P>
Entanglement Reciprocation between Qubits and Continuous Variables
Lee, Jinhyoung,Paternostro, M.,Kim, M. S.,Bose, S. American Physical Society 2006 Physical review letters Vol.96 No.8
<P>We investigate how entanglement can be transferred between qubits and continuous-variable (CV) systems. We find that one ebit borne in maximally entangled qubits can be fully transferred to two CV systems which are initially prepared in a pure separable Gaussian field with high excitation. We show that it is possible to retrieve the entanglement back to qubits from the entangled CV systems. The deposition of multiple ebits from qubits to the initially separable CV systems is also pointed out. We show that the entanglement transfer and retrieval are done at a quasisteady state.</P>