Probing the evolution of quantum superposition states in a nuclear spin-5/2 system
We report the effects of off-diagonal coupling on eigenstates and eigenvalues of a realistic quantum Hamiltonian, a ^{121}Sb (spin I=5/2) nuclear spin Hamiltonian in an antimony single crystal. In our nuclear resonance experiment, off-diagonal matrix elements are generated and controlled by the angl...
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Published in | Physical review research Vol. 5; no. 3; p. 033105 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
American Physical Society
15.08.2023
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Online Access | Get full text |
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Summary: | We report the effects of off-diagonal coupling on eigenstates and eigenvalues of a realistic quantum Hamiltonian, a ^{121}Sb (spin I=5/2) nuclear spin Hamiltonian in an antimony single crystal. In our nuclear resonance experiment, off-diagonal matrix elements are generated and controlled by the angle θ between the directions of the electric field gradient and an external magnetic field. With a very small θ, a two-state-like avoided level crossing is directly probed as a function of an external magnetic field. On the other hand, by increasing θ under a weak magnetic field, we find that the nuclear spin transitions undergo dramatic changes as θ approaches 90^{∘}. All our experimental observations are in excellent agreement with exact diagonalization calculations for the Hamiltonian, demonstrating how superposition states of a multistate quantum system evolve as a function of a well-defined control parameter. |
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Bibliography: | USDOE Office of Science (SC), Basic Energy Sciences (BES) AC02-07CH11358 |
ISSN: | 2643-1564 2643-1564 |
DOI: | 10.1103/PhysRevResearch.5.033105 |