Macroscopic Schrödinger Cat Resistant to Particle Loss and Local Decoherence
arXiv:1207.5239 · doi:10.1103/PhysRevA.87.052117
Abstract
The Schrödinger cat state plays a crucial role in quantum theory, and has important fundamental as well as technological implications, ranging from quantum measurement theory to quantum computers. The power of the potential implications of the cat state lies in the quantum coherence, as measured by the degree of entanglement, between its microscopic and macroscopic sectors. We show that in contrast to other cat states, it is possible to choose the states of the macroscopic sector in a way that the resulting cat state, which we term as the W-cat state, has quantum coherence that is resistant to the twin effects of environmental noise -- local decoherence on all the particles and loss of a finite fraction of its particles. The states of the macroscopic sector of the W-cat state are macroscopically distinct in terms of their violation of Bell inequality.
6 pages, 4 figures, Revtex4-1
References in corpus (23)
- Many-Body Physics with Ultracold Gases
- The classical-quantum boundary for correlations: discord and related measures
- Scalable multi-particle entanglement of trapped ions
- Quantum computing with trapped ions
- 14-qubit entanglement: creation and coherence
- On the quantum, classical and total amount of correlations in a quantum state
- Entanglement versus Correlations in Spin Systems
- Detecting Genuine Multipartite Entanglement with Two Local Measurements
- Scaling laws for the decay of multiqubit entanglement
- 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
- Open-system dynamics of graph-state entanglement
- Noisy entanglement evolution for graph states
- Scalability of GHZ and random-state entanglement in the presence of decoherence
- Multipartite quantum nonlocality under local decoherence
- Stability of encoded macroscopic quantum superpositions
- Are cloned quantum states macroscopic?
- More non-locality in the three-qubit Greenberger-Horne-Zeilinger state
- Visualization of superposition of macroscopically distinct states