Geometric curvature of a metric-induced connection and non-trivial holonomies around non-contractible loops obstruct global Hermitianization of quasi-Hermitian quantum systems.
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Effective gain engineered through evaporative cooling of thermal atoms enables Bose-Einstein condensation in a topological edge state of a synthetic hyperfine SSH lattice, realizing a topological atom laser.
Non-Hermitian XY model provides first spin-based realization of an idle-level quantum Otto engine where non-Hermiticity compresses the idle gap to improve work and efficiency.
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Geometric and Topological Obstructions to Hermitianization in Quasi-Hermitian Quantum Systems
Geometric curvature of a metric-induced connection and non-trivial holonomies around non-contractible loops obstruct global Hermitianization of quasi-Hermitian quantum systems.
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Gain engineering and atom lasing in a topological edge state in synthetic dimensions
Effective gain engineered through evaporative cooling of thermal atoms enables Bose-Einstein condensation in a topological edge state of a synthetic hyperfine SSH lattice, realizing a topological atom laser.
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Quantum Otto engine with field-decoupled idle levels in a non-Hermitian XY model
Non-Hermitian XY model provides first spin-based realization of an idle-level quantum Otto engine where non-Hermiticity compresses the idle gap to improve work and efficiency.