scholarly journals Scaling of the decoherence factor of a qubit coupled to a spin chain driven across quantum critical points

2012 ◽  
Vol 86 (2) ◽  
Author(s):  
Tanay Nag ◽  
Uma Divakaran ◽  
Amit Dutta
Keyword(s):  
Critical Points ◽  
Spin Chain ◽  
Quantum Critical Points ◽  
Quantum Critical

scholarly journals QUENCHING DYNAMICS AND QUANTUM INFORMATION

2012 ◽  
Vol 27 (01n03) ◽  
pp. 1345036 ◽  
Author(s):  
TANAY NAG ◽  
AMIT DUTTA ◽  
AYOTI PATRA
Keyword(s):  
Critical Points ◽  
Spin Chain ◽  
Quantum Discord ◽  
Closed Form Expression ◽  
Spin Interaction ◽  
Qualitative Behavior ◽  
Final State ◽  
Quantum Critical Points ◽  
Xy Spin Chain ◽  
Quantum Critical

We review recent studies on the measures of zero temperature quantum correlations namely, the quantum entanglement (concurrence) and discord present in the final state of a transverse XY spin chain following a quench through quantum critical points; the aim of these studies is to explore the scaling of the above quantities as a function of the quench rate. A comparative study between the concurrence and the quantum discord shows that their behavior is qualitatively the same though there are quantitative differences. For the present model, the scaling of both the quantities are given by the scaling of the density of the defect present in the final state though one cannot find a closed form expression for the discord. We also extend our study of quantum discord to a transverse Ising chain in the presence of a three spin interaction. Finally, we present a study of the dynamical evolution of quantum discord and concurrence when two central qubits, initially prepared in a Werner state, are coupled to the environmental XY spin chain which is driven through quantum critical points. The qualitative behavior of quantum discord and concurrence are found to be similar as that of the decoherence factor.

scholarly journals Quantum critical points in ferroelectric relaxors: Stuffed tungsten bronze K3Li2Ta5O15 and lead pyrochlore ( Pb2Nb2O7 )

2018 ◽  
Vol 2 (8) ◽  
Author(s):  
Rebecca M. Smith ◽  
Jonathan Gardner ◽  
Finlay D. Morrison ◽  
S. E. Rowley ◽  
Catarina Ferraz ◽  
...  
Keyword(s):  
Critical Points ◽  
Tungsten Bronze ◽  
Quantum Critical Points ◽  
Ferroelectric Relaxors ◽  
Quantum Critical

scholarly journals Theory of Finite-Entanglement Scaling at One-Dimensional Quantum Critical Points

2009 ◽  
Vol 102 (25) ◽  
Author(s):  
Frank Pollmann ◽  
Subroto Mukerjee ◽  
Ari M. Turner ◽  
Joel E. Moore
Keyword(s):  
Critical Points ◽  
Quantum Critical Points ◽  
One Dimensional ◽  
Quantum Critical

scholarly journals Disorder Induced Cross-Over Effects at Quantum Critical Points

2001 ◽  
Vol 87 (27) ◽  
Author(s):  
Enrico Carlon ◽  
Péter Lajkó ◽  
Ferenc Iglói
Keyword(s):  
Critical Points ◽  
Quantum Critical Points ◽  
Quantum Critical

scholarly journals Scaling approach to itinerant quantum critical points

2004 ◽  
Vol 69 (17) ◽  
Author(s):  
Catherine Pépin ◽  
Jérome Rech ◽  
Revaz Ramazashvili
Keyword(s):  
Critical Points ◽  
Quantum Critical Points ◽  
Quantum Critical

scholarly journals Ultrasonic investigation of NiCl2-4SC(NH2)2in the vicinity of the quantum critical points

2009 ◽  
Vol 145 ◽  
pp. 012069 ◽  
Author(s):  
S Zherlitsyn ◽  
O Chiatti ◽  
A Sytcheva ◽  
J Wosnitza ◽  
A A Zvyagin ◽  
...  
Keyword(s):  
Critical Points ◽  
Quantum Critical Points ◽  
Quantum Critical ◽  
Ultrasonic Investigation
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