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Quantum probing topological phase transitions by non-Markovianity

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arxiv 1907.05080 v2 pith:F34GDCMC submitted 2019-07-11 quant-ph cond-mat.mes-hall

Quantum probing topological phase transitions by non-Markovianity

classification quant-ph cond-mat.mes-hall
keywords topologicalnon-markovianityphaseprobingchaindecoherencequantumqubit
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Understanding the physical significance and probing the global invariants characterizing quantum topological phases in extended systems is a main challenge in modern physics with major impact in different areas of science. Here, a quantum-information-inspired probing method is proposed where topological phase transitions are revealed by a non-Markovianity quantifier. The idea is illustrated by considering the decoherence dynamics of an external read-out qubit that probes a Su-Schrieffer-Heeger (SSH) chain with either pure dephasing or dissipative coupling. Qubit decoherence features and non-Markovianity measure clearly signal the topological phase transition of the SSH chain.

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