Author ORCID Identifier

0009-0005-3849-8929

Date of Award

8-31-2026

Document Type

Open Access Thesis

Degree Name

Master of Science (MS)

Department

Physics, Applied

First Advisor

Akira Sone

Abstract

The conditional thermal state (CTS) is a probe-specific quantum thermal state that is known to outperform the Gibbs state in quantum thermometric measurements at sufficiently low temperatures. This thesis introduces a variational quantum algorithm designed to prepare the CTS on quantum computing hardware which optimizes the angular parameters of the quantum gates that comprise the ansatz circuit and, for the one-qubit case, minimizes relative infidelity of the output state with the known CTS. Using noiseless numerical simulations (SPSA with Qiskit), attempting to prepare the CTS yielded relative infidelities with the known CTS on the order of $10^{-5}$ for most parameter combinations tested, showing that the variational quantum algorithm highly successfully reproduces the CTS in the one-qubit case, which is promising for future efforts to prepare the CTS for one or more qubits on real hardware so that it may be applied for subsequent research.

Comments

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