Detecting Out-of-Time-Order Correlations via Quasiadiabatic Echoes as a Tool to Reveal Quantum Coherence in Equilibrium Quantum Phase Transitions.

Autor:	Lewis-Swan RJ; Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, Norman, Oklahoma 73019, USA.; JILA, NIST, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.; Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA., Muleady SR; JILA, NIST, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.; Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA., Rey AM; JILA, NIST, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.; Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2020 Dec 11; Vol. 125 (24), pp. 240605.
DOI:	10.1103/PhysRevLett.125.240605
Abstrakt:	We propose a new dynamical method to connect equilibrium quantum phase transitions and quantum coherence using out-of-time-order correlations (OTOCs). Adopting the iconic Lipkin-Meshkov-Glick and transverse-field Ising models as illustrative examples, we show that an abrupt change in coherence and entanglement of the ground state across a quantum phase transition is observable in the spectrum of multiple quantum coherence intensities, which are a special type of OTOC. We also develop a robust protocol to obtain the relevant OTOCs using quasi-adiabatic quenches through the ground state phase diagram. Our scheme allows for the detection of OTOCs without time reversal of coherent dynamics, making it applicable and important for a broad range of current experiments where time reversal cannot be achieved by inverting the sign of the underlying Hamiltonian.
Databáze:	MEDLINE
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