Sudden change of quantum discord for a system of two qubits
arXiv:1309.7945 · doi:10.1103/PhysRevA.88.034304
Abstract
It is known that quantum discord might experience a sudden transition in its dynamics when calculated for certain Bell-diagonal states (BDS) that are in interaction with their surroundings. We examine this phenomenon known as the sudden change of quantum discord, considering the case of two qubits independently interacting with dephasing reservoirs. We first numerically demonstrate that, for a class of initial states which can be chosen arbitrarily close to BDS, the transition is in fact not sudden, although it might numerically appear so if not studied carefully. Then, we provide an extension of this discussion covering the X-shaped density matrices. Our findings suggest that the transition of quantum discord might be sudden only for an highly idealized zero-measure subset of states within the set of all possible initial conditions of two qubits.
5 pages, 2 figures (Published version)
References in corpus (4)
Cited by in corpus (29)
- Quantum discord and its allies: a review
- Observation of environment-induced double sudden transitions in geometric quantum correlations
- Non-Markovian evolution: a quantum walk perspective
- Unifying approach to the quantification of bipartite correlations by Bures distance
- On the quantum discord of general X states
- To freeze or not to: Quantum correlations under local decoherence
- Trace-distance correlations for X states and emergence of the pointer basis in Markovian and non-Markovian regimes
- Dynamics of genuine multipartite entanglement under local non-Markovian dephasing
- Universal evolution of non-classical correlations due to collective spontaneous emission
- Collapse-revival of quantum discord and entanglement
- Sudden change of geometric quantum discord in finite temperature reservoirs
- Hierarchy of quantum correlations under non-Markovian dynamics
- Sudden change in dynamics of genuine multipartite entanglement of cavity-reservoir qubits
- Quantum Correlations Dynamics In Two Coupled Semiconductor InAs Quantum Dots
- On the pseudospectrum of the harmonic oscillator with imaginary cubic potential
- Characterizing qubit channels in the context of quantum teleportation
- Scale-invariant freezing of entanglement
- Sudden Freezing and Thawing of Entanglement Sharing in a Shrunken Volume
- Thermal effects on the sudden changes and freezing of correlations between remote atoms in cavity QED network
- Sudden transitions of trace distance discord of dipole-dipole coupled two qubits
- Quantum Correlations in Cavity QED Networks
- Quantum correlation evolution of GHZ and W states under noisy channels using ameliorated measurement-induced disturbance
- Sudden Decoherence Transitions for Quantum Discord
- Frozen and Invariant Quantum Discord under Local Dephasing Noise
- Landau-type sudden transitions of quantum correlations
- Sudden change of interferometric power for X shape states
- Computable Measure of Total Quantum Correlation of Multipartite Systems
- Robustness of Interferometric Power to Sudden Death
- Freezing and Thawing of Entanglement in Lossless Multiparty Systems