Quantum Disentanglement Underlying Long-range Orders and Spontaneous Symmetry Breaking

نویسنده

  • Yu Shi
چکیده

We consider relations between reduced density matrices in the configuration space of identical particles and those in Fock space, leading to the conclusion that diminishing of entanglement underlies off-diagonal long-range order, which is the hallmark of superconductivity and Bose-Einstein condensation. The discussion is also extended to show that disentanglement underlies various cases of long-range order and spontaneous symmetry breaking. We present some ideas on characterizing and experimentally measuring entanglement in many-body systems, and calculate the entanglement in nearest-neighbor RVB

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تاریخ انتشار 2002