Local Decoherence-free Macroscopic Quantum states
arXiv:1401.3208 · doi:10.1016/j.physleta.2014.11.037
Abstract
We identify a class of quantum states, each consisting of a microscopic and a macroscopic section, that are effectively decoherence-free when each particle is locally passed through a quantum channel. In particular, and in contrast to other macroscopic quantum states like the Greenberger-Horne-Zeilinger state, the content of entanglement and other quantum correlations in the microscopic to macroscopic partition of this class of states is independent of the number of particles in their macroscopic sectors, when all the particles suffer passage through local amplitude and phase damping channels. Decay of quantum correlations -- entanglement as well as quantum discord -- of this class of states in the microscopic to macroscopic partition is also much lower in the case of all the local quantum channels, as compared to the other macroscopic superposition states. The macroscopic sections of the states are formed, in each case, by using a Dicke state and an orthogonal product state, which are macroscopically distinct in terms of markedly different amounts of violation of Bell inequality.
13 pages, 16 figs, RevTeX4.1
References in corpus (19)
- Device-independent security of quantum cryptography against collective attacks
- Quantum discord and the power of one qubit
- Necessary and sufficient condition for non-zero quantum discord
- 14-qubit entanglement: creation and coherence
- Experimental quantum computing without entanglement
- On the quantum, classical and total amount of correlations in a quantum state
- On the role of entanglement and correlations in mixed-state quantum computation
- Localizable Entanglement
- Scaling laws for the decay of multiqubit entanglement
- Macroscopicity of Mechanical Quantum Superposition States
- Multiparticle entanglement under the influence of decoherence
- Measures of macroscopicity for quantum spin systems
- Quantification of Macroscopic Quantum Superpositions within Phase Space
- Stable macroscopic quantum superpositions
- A measurement-based measure of the size of macroscopic quantum superpositions
- Measuring the size of a Schroedinger cat state
- Robustness of Highly Entangled Multi-Qubit States Under Decoherence
- Signatures for generalized macroscopic superpositions
- The size of quantum superpositions as measured with "classical" detectors