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QI: Fachverband Quanteninformation

QI 15: Quantum Computing Implementations (joint session QI/Q)

QI 15.3: Vortrag

Dienstag, 11. März 2025, 14:30–14:45, HS II

Demonstrations of system-bath physics on gate-based quantum computer — Pascal Stadler, Matteo Lodi, Andisheh Khedri, Rolando Reiner, Kirsten Bark, Nicolas Vogt, Michael Marthaler, and •Juha Leppäkangas — HQS Quantum Simulations GmbH, Rintheimer Straße 23, 76131 Karlsruhe, Germany

We develop a quantum algorithm that can be used to perform algorithmic cooling on noisy quantum computers. The approach utilizes inherent qubit noise to simulate the equilibration of an interacting spin system towards its ground state, when coupled to a simulated dissipative auxiliary-spin bath. We test the algorithm on IBM-Q devices and demonstrate the relaxation of system spins to ferromagnetic and antiferromagnetic ordering, controlled by the definition of the system Hamiltonian. The ordering is stable as long as the algorithm is run. We are able to perform cooling and state stabilization for global systems of up to three system spins and four auxiliary spins.

Keywords: Quantum simulation; Algorithmic cooling; Open quantum system; Noisy quantum computer; Non-unitary gates