3 papers
quant-ph2026
Continuous time crystals as a PT symmetric state and the emergence of critical exceptional points
Yuma Nakanishi, Ryo Hanai, Tomohiro Sasamoto
Continuous time-translation symmetry is often spontaneously broken in open quantum systems, and the condition for their emergence has been actively investigated. However, there are…
quant-ph2026
Quantum Spin Squeezing Enhanced by Critical Exceptional Points
Yuma Nakanishi
Critical exceptional points (CEPs) are nonequilibrium critical points in open many-body systems at which multiple collective excitation modes coalesce. CEPs are known to amplify cl…
quant-ph2025
Lindbladian PT phase transitions
Yuma Nakanishi, Tomohiro Sasamoto
A parity-time (PT) transition is a spectral transition characteristic of non-Hermitian generators; it typically occurs at an exceptional point, where multiple eigenvectors coalesce…