Energy entanglement in neutron interferometry
arXiv:1008.0794 · doi:10.1016/j.physb.2010.11.056
Abstract
Entanglement between degrees of freedom, namely between the spin, path and (total) energy degrees of freedom, for single neutrons is exploited. We implemented a triply entangled Greenberger-Horne-Zeilinger(GHZ)-like state and coherently manipulated relative phases of two-level quantum subsystems. An inequality derived by Mermin was applied to analyze the generated GHZ-like state: we determined the four expectation values and finally obtained M=2.558 +/- 0.004 which is clearly above the threshold of 2. This demonstrates the violation of a Mermin-like inequality for triply entangled GHZ-like state in a single-particle system, which, in turn, exhibits a clear inconsistency between noncontextual assumptions and quantum mechanics and confirms quantum contextuality.
4 pages, 3 figures
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- Hidden Variables and the Two Theorems of John Bell
- Bell inequality violation with two remote atomic qubits
- State-independent quantum contextuality with single photons
- Coherent energy manipulation in single-neutron interferometry
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