Title of article :
From quantum correlations in dissipative quantum walk to two-qubit systems
Author/Authors :
Nizama Salihefendic، نويسنده , , Marco and Cلceres، نويسنده , , Manuel O.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
16
From page :
31
To page :
46
Abstract :
A dissipative quantum walk (according to the semigroup approach) has been used as the starting point from which to study quantum correlations in an open system. This system is a fruitful model that allows the definition of several bipartite systems (sets of qubits). Thus the quantum correlations and the decoherence properties induced by a phonon bath can be investigated analytically using tools from quantum information. In particular we have studied the negativity, concurrence and quantum discord for different bipartitions in our dissipative system, and we have found analytical expression for these measures, using a local initial condition for the density matrix of the walker. In general quantum correlations are affected by dissipation in a complex non-monotonic way, showing at long time an expected asymptotic decrease with the increase of the dissipation. In addition, our results for the quantum correlations can be used as an indicator of the transition from the quantum to the classical regimen, as has recently been shown experimentally.
Keywords :
Quantum Walk , Tight-binding , Quantum master equation , Quantum decoherence , quantum entanglement , quantum discord
Journal title :
Physica A Statistical Mechanics and its Applications
Serial Year :
2014
Journal title :
Physica A Statistical Mechanics and its Applications
Record number :
1738059
Link To Document :
بازگشت