Measurement of the energy relaxation time of quantum states in quantum annealing with a D-Wave machine

• URL: http://arxiv.org/abs/2302.10486v1
• Date: Tue, 21 Feb 2023 07:29:23 GMT
• Title: Measurement of the energy relaxation time of quantum states in quantum annealing with a D-Wave machine
• Authors: Takashi Imoto, Yuki Susa, Tadashi Kadowaki, Ryoji Miyazaki, Yuichiro Matsuzaki
• Abstract summary: We propose and demonstrate a method to measure the coherence time of the excited state in quantum annealing with the D-Wave device. We find that the energy relaxation time of the excited states of the model is orders of magnitude longer than that of the excited state of a single qubit.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum annealing has been demonstrated with superconducting qubits. Such a quantum annealer has been used to solve combinational optimization problems and is also useful as a quantum simulator to investigate the properties of the quantum many-body systems. However, the coherence properties of actual devices provided by D-Wave Quantum Inc. are not sufficiently explored. Here, we propose and demonstrate a method to measure the coherence time of the excited state in quantum annealing with the D-Wave device. More specifically, we investigate the energy relaxation time of the first excited states of a fully connected Ising model with a transverse field. We find that the energy relaxation time of the excited states of the model is orders of magnitude longer than that of the excited state of a single qubit, and we qualitatively explain this phenomenon by using a theoretical model. The reported technique provides new possibilities to explore the decoherence properties of quantum many-body systems with the D-Wave machine.

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