Decoherence induced by a composite environment

Probing a composite spin-boson environment

We consider non-interacting multi-qubit systems as controllable probes of an environment of defects/impurities modelled as a composite spinboson environment. The spin-boson environment consists of a small number of quantum-coherent two-level fluctuators (TLFs) damped by independent bosonic baths. A master equation of the Lindblad form is derived for the probeplus-TLF system. We discuss how corr...

Highly Nonclassical Quantum States and Environment Induced Decoherence Highly Nonclassical Quantum States and Environment Induced Decoherence

Decoherence time in self-induced decoherence

A general method for obtaining the decoherence time in self-induced decoherence is presented. In particular, it is shown that such a time can be computed from the poles of the resolvent or of the initial conditions in the complex extension of the Hamiltonian’s spectrum. Several decoherence times are estimated: 10−13–10−15 s for microscopic systems, and 10−37–10−39 s for macroscopic bodies. For ...

Measurements and Decoherence

A pedagogical and reasonably self-contained introduction to the measurement problems in quantum mechanics and their partial solution by environment-induced decoherence (plus some other important aspects of decoherence) is given.The point that decoherence does not solve the measurement problems completely is clearly brought out. The relevance of interpretation of quantum mechanics in this contex...

Decoherence by a nonlinear environment : canonical vs . microcanonical case

We compare decoherence induced in a simple quantum system (qubit) for two different initial states of the environment: canonical (fixed temperature) and microcanonical (fixed energy), for the general case of a fully interacting oscillator environment. We find that even a relatively compact oscillator bath (with the effective number of degrees of freedom of order 10), initially in a microcanonic...