A model of a system driven by quantum white noise with singular quadratic self–interaction is considered and an exact solution for the evolution operator is found. It is shown that the renormalized square of the squeezed classical white noise is equivalent to the quantum Poisson process. We describe how equations driven by nonlinear functionals of white noise can be derived in nonlinear quantum...

A model for the photon noise and the current noise in quantum cascade lasers is presented. It is shown that compared to diode lasers quantum cascade lasers exhibit much less photon-number squeezing even when the noise in the drive current is suppressed well below the shot-noise value. The theoretical model presented in this paper self-consistently accounts for the suppression of the current noi...

The 1/f noise investigation in nanoscale light-emitting diodes and lasers, based on GaAs and alloys, is presented here. Leakage and additional (to recombination through quantum wells and/or dots) nonlinear currents were detected and it was shown that these currents are the main source of the 1/f noise in devices studied. Keywords—Lasers, light-emitting diodes, quantum dots, quantum wells, 1/f n...

The superiority of quantum computation over conventional computation relies on the fact that a quantumbit (qubit) register can be in the superposition of a very large number of classical computational states. At the same time, maintaining coherence of this highly superpositional state poses also the main obstacle for the realization of a quantum computer. For a small number of qubits this diffi...