Atoms Trapped with Light Behave Like a Dissipative Quantum System
© The Physical Society of Japan
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Prog. Theor. Exp. Phys.
2020,
12A110
(2020)
.
Elementary quantum physics usually tackles quantum systems that are energyconserving and described well by a Hermitian Hamiltonian. In reality, however, many quantum systems are dissipative in nature and can only be described effectively using a nonHermitian Hamiltonian. Consequently, nonHermitian quantum physics has garnered considerable attention from researchers across diverse subfields of physics.
In condensed matter physics, for instance, manybody systems are a widely researched topic. The electrons in these systems interact strongly with one another, giving rise to quantum states that cannot be described by knowing the equation of motion of a single electron. Recent theoretical studies have now revealed that manybody systems can be dissipative with paritytime (or PT)symmetry and show unique exotic phases with no counterpart in conservative systems.
Against this backdrop, a team of physicists from Japan have recently experimentally realized a PTsymmetric, nonHermitian, manybody system from ultracold Ytterbium atoms trapped in an optical lattice formed by interfering counterpropagating laser beams. In their study, the team experimentally investigated the ideal conditions for oneand twobody dissipation and developed methods to measure and control relative phases between on and offresonant lattices for PT symmetry. Additionally, they constructed a new theoretical framework to predict the appearance of interesting loss dynamics.
The experimental system developed by the team could serve as a future platform for investigating novel and uniquely nonHermitian quantum phenomena as well as extend the nonHermitian perspective to other quantum systems, potentially revolutionizing our understanding of manybody systems as a whole.
Prog. Theor. Exp. Phys.
2020,
12A110
(2020)
.
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