3 papers
quant-ph2026
Initiation of Superradiance from Different Collective-Spin States
Adnan Alabbar, Zhenghao Zhang, Girish S. Agarwal
Superradiance is an extensive cooperative spontaneous emission phenomenon, exhibited by some atomic collective-spin states. However, distinct initial states differ in their decay d…
quant-ph2026
Quantum nonreciprocity from qubits coupled by Dzyaloshinskii-Moriya interaction
Zhenghao Zhang, Qingtian Miao, G. S. Agarwal
We present a theoretical study of quantum nonreciprocity induced via a Dzyaloshinskii-Moriya interaction (DMI) in an otherwise achiral, waveguide quantum electrodynamics. Using the…
quant-ph2025
Time crystals and nonequilibrium dissipative phase transitions mediated by squeezed bath
Zhenghao Zhang, Qingtian Miao, G. S. Agarwal
Nonequilibrium dissipative phase transition, arising from the competition of cooperative behavior and coherent field driving, discovered in the 1970s by Narducci et al. and Walls e…