Quantum fidelity in the thermodynamic limit.
نویسندگان
چکیده
We study quantum fidelity, the overlap between two ground states of a many-body system, focusing on the thermodynamic regime. We show how a drop in fidelity near a critical point encodes universal information about a quantum phase transition. Our general scaling results are illustrated in the quantum Ising chain for which a remarkably simple expression for fidelity is found.
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ورودعنوان ژورنال:
- Physical review letters
دوره 106 5 شماره
صفحات -
تاریخ انتشار 2011