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TT: Fachverband Tiefe Temperaturen

TT 43: Superconducting Electronics: Qubits

TT 43.10: Vortrag

Mittwoch, 11. März 2026, 12:00–12:15, CHE/0089

Quantum dynamics of two XY interacting PT-symmetric non-Hermitian qubits: enhancement of quantum annealing — •Yana Komissarova, Mikhail V. Fistul, and Ilya M. Eremin — Institut für Theoretische Physik III, Ruhr-Universität Bochum, Bochum 44801, Germany

Quantum information processing devices enable the realization of analog quantum simulations, such as quantum annealing, and offer a promising route toward solving complex computational and combinatorial optimization problems. In this work, we introduce a new type of quantum information platform based on a network of interacting parity-time (PT) symmetric non-Hermitian qubits. The quantum dynamics of individual PT-symmetric non-Hermitian qubits have already been demonstrated experimentally using several approaches, including dilation schemes with digital coupling to an auxiliary qubit. These experiments carried out on a variety of platforms, such as NV centers, superconducting qubits, and superconducting and trapped-ion qutrits, have revealed exceptional points of different orders, as well as PT-symmetry-preserving and symmetry-breaking quantum states. A key next step is the investigation of coherent quantum dynamics in systems of interacting PT-symmetric non-Hermitian qubits. Here, we study both time-independent and time-dependent Hamiltonians relevant for quantum annealing in an exemplary two-qubit non-Hermitian network based on the XY model. We analyze the system in both PT-symmetric and PT-broken regimes to identify conditions that maximize the probability of reaching the ground state after quantum annealing.

Keywords: non-Hermitian; Quantum annealing; PT-symmetry; XY model