Upper Limit of Pure Dephasing Time of a Paired-Qubit with Anisotropic Heisenberg Coupling

Jun-ichi Inoue

doi:10.7566/JPSJ.93.073801

Article Upper Limit of Pure Dephasing Time of a Paired-Qubit with Anisotropic Heisenberg Coupling

Jun-ichi Inoue (Research Center for Electronic and Optical Materials/Optical Materials Field/Semiconductor Defect Design Group, National Institute for Materials Science)

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Jun-ichi Inoue. Upper Limit of Pure Dephasing Time of a Paired-Qubit with Anisotropic Heisenberg Coupling. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN. 2024, 93 (7), 073801. https://doi.org/10.7566/JPSJ.93.073801

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Prolongation of a pure dephasing time of a qubit by coupling with another one with longer dephasing times is theoretically studied.
The analysis is performed for a paired-qubit, both of which interact in an anisotropic Heisenberg manner, using the Lindblad master equation.
The pure dephasing time is found to be a nontrivially increasing function of in-plane but not longitudinal components of the interaction, and to saturate finally, where a strong coupling-like state of those qubits is suggested.
The two-qubit system well suits NV^ー centers in diamond where one (the other) is that located at a surface of (embeded inside) the diamond, so that
feasible experiments with the centers are proposed to test the results.
The finding would offer a solution to challenge in applications of those qubits.

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