Issue |
EPL
Volume 114, Number 6, June 2016
|
|
---|---|---|
Article Number | 60007 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/114/60007 | |
Published online | 20 July 2016 |
Adiabatic freezing of long-range quantum correlations in spin chains
Harish-Chandra Research Institute - Chhatnag Road, Jhunsi, Allahabad 211 019, India
Received: 2 February 2016
Accepted: 22 June 2016
We consider a process to create quasi–long-range quantum discord between the non-interacting end spins of a quantum spin chain, with the end spins weakly coupled to the bulk of the chain. The process is not only capable of creating long-range quantum correlation but the latter remains frozen, when certain weak end-couplings are adiabatically varied below certain thresholds. We term this phenomenon as adiabatic freezing of quantum correlation. We observe that the freezing is robust to moderate thermal fluctuations and is intrinsically related to the cooperative properties of the quantum spin chain. In particular, we find that the energy gap of the system remains frozen for these adiabatic variations, and moreover, considering the end spins as probes, we show that the interval of freezing can detect the anisotropy transition in quantum XY spin chains. Importantly, the adiabatic freezing of long-range quantum correlations can be simulated with contemporary experimental techniques.
PACS: 03.67.-a – Quantum information / 03.67.Bg – Entanglement production and manipulation / 75.10.Jm – Quantized spin models, including quantum spin frustration
© EPLA, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.