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Non-Hermitian topology in monitored quantum circuits
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0002-6750-3265
KTH, School of Engineering Sciences (SCI), Physics.
Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden..
Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden..ORCID iD: 0000-0002-9739-2930
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2022 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 4, no 3, article id L032026Article in journal (Refereed) Published
Abstract [en]

We demonstrate that genuinely non-Hermitian topological phases and corresponding topological phase tran-sitions can be naturally realized in monitored quantum circuits, exemplified by the paradigmatic non-Hermitian Su-Schrieffer-Heeger model. We emulate this model by a 1D chain of spinless electrons evolving under unitary dynamics and subject to periodic measurements that are stochastically invoked. The non-Hermitian topology is visible in topological invariants adapted to the context of monitored circuits. For instance, the topological phase diagram of the monitored realization of the non-Hermitian Su-Schrieffer-Heeger model is obtained from the biorthogonal polarization computed from an effective Hamiltonian of the monitored system. Importantly, our monitored circuit realization allows direct access to steady-state biorthogonal expectation values of generic observables, and hence, to measure physical properties of a genuine non-Hermitian model. We expect our results to be applicable more generally to a wide range of models that host non-Hermitian topological phases.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 4, no 3, article id L032026
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Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-322146DOI: 10.1103/PhysRevResearch.4.L032026ISI: 000878118500004Scopus ID: 2-s2.0-85137264148OAI: oai:DiVA.org:kth-322146DiVA, id: diva2:1715651
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QC 20221202

Available from: 2022-12-02 Created: 2022-12-02 Last updated: 2022-12-02Bibliographically approved

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Fleckenstein, ChristophZorzato, AlbertoBardarson, Jens H.Tiwari, Apoorv

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Fleckenstein, ChristophZorzato, AlbertoBergholtz, Emil J.Bardarson, Jens H.Tiwari, Apoorv
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