Hidden PT symmetry and quantization of a coupled-oscillator model of quantum amplification by superradiant emission of radiation Academic Article uri icon


  • 2017 American Physical Society. With Maxwell-Bloch equations how the superradiance can lead to amplification and gain at a frequency much larger than the pumping frequency has been shown. This remarkable effect has been examined in terms of a simpler model involving two coupled oscillators, with one of them parametrically driven. We show that this coupled-oscillator model has a hidden parity-time (PT) symmetry for quantum amplification by superradiant emission of radiation (QASER); we thus bring PT symmetry to the realm of parametrically coupled resonators. Moreover, we find that the QASER gain arises from the broken-PT-symmetry phase. We then quantize the simplified version of QASER using quantum Langevin equations. The quantum description enables us to understand how the system starts from quantum fluctuations.

published proceedings


altmetric score

  • 1.25

author list (cited authors)

  • Zhang, L., Agarwal, G. S., Schleich, W. P., & Scully, M. O.

citation count

  • 12

complete list of authors

  • Zhang, Lida||Agarwal, GS||Schleich, WP||Scully, MO

publication date

  • July 2017