Nonlinearity and nonclassicality in single-qubit laser operation

作者：Kilin Sergei Ya^*; Mikhalychev Alexander B

来源：Physica Scripta, 2014, T160: 014021.

DOI：10.1088/0031-8949/2014/T160/014021

• single-qubit laser
• nonclassical state
• nonlinear coherent state

We investigate an incoherently pumped single-qubit laser as a system, providing optical nonlinearity for the generation of nonclassical states. We show that, in the general case of arbitrary values of coupling strength and other system parameters, the stationary state of an incoherently pumped single-qubit laser is a nonlinear coherent state, being the phase-averaged eigenstate of the deformed annihilation operator of a specific form. The manifestation of the inherent nonlinearity of the system is found in the form of the stationary state nonclassicality, present for any values of the system parameters. Another important implication of inherent system nonlinearity and nonclassicality is the impossibility of describing the lasing effect by means of field-independent spontaneous and induced transition probabilities, as in the case of a conventional laser.

• 出版日期2014-4