aqora

Frozen Quantum Coherence for a Central Two-Qubit System in a Spin-Chain Environment

Yang Yang, An Min Wang, Lianzhen Cao +2 more

We investigate the dynamics of coherence for a central two-qubit system coupled to an XY spin chain with the Dzyaloshinsky–Moriya interaction. It is found that a sudden transition of coherence exists near the critical point in the weak-coupling case, and an oscillatory envelope appears in the strong-coupling case. In both cases the freezing phenomenon of coherence can be found.

Chinese Physics LettersAug 1, 20183 citations

Preparation of freezing quantum state for quantum coherence

Lian-Wu Yang, Zhong‐Xiao Man, Ying-Jie Zhang +3 more

Quantum Information ProcessingApr 19, 20182 citations

Freezing a quantum magnet by repeated quantum interference: An experimental realization

Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh +1 more

We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [A. Das, Phys. Rev. B 82, 172402 (2010)], for certain values of the drive parameters all fundamental degrees of freedom contributing to the response dynamics freeze for all time and for arbitrary initial state. Also, since the condition of freezing involves only the drive parameters and not the quantization of the momentum (i.e., the system size), our simulation with a small (3-spin) chain captures all salient features of the freezing phenomenon predicted for the infinite chain. Using optimal control techniques, we realize high-fidelity cosine-modulated drive, and observe nonmonotonic freezing of magnetization at specific frequencies of modulation. Time evolution of the excitations in momentum space has been tracked directly through magnetization measurements.We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [A. Das, Phys. Rev. B 82, 172402 (2010)], for certain values of the drive parameters all fundamental degrees of freedom contributing to the response dynamics freeze for all time and for arbitrary initial state. Also, since the condition of freezing involves only the drive parameters and not the quantization of the momentum (i.e., the system size), our simulation with a small (3-spin) chain captures all salient features of the freezing phenomenon predicted for the infinite chain. Using optimal control techniques, we realize high-fidelity cosine-modulated drive, and observe nonmonotonic freezing of magnetization at specific frequencies of modulation. Time evolution of the excitations in momentum space has been tracked directly through magnetization measurements.

arXiv:1307.8219Physical Review BNov 7, 201471 citations

Quantum coherence and its distribution in the extended Ising chain

Shaoying Yin, Jie Song, Yueyuan Wang +3 more

Quantum Information ProcessingSep 28, 20217 citations

Dynamics of quantum coherence and correlations in a transverse Ising spin chain environment

Qi Han, Huan Wang, Shuai Wang +2 more

In this paper, we study the dynamical processes of quantum coherence and correlations for two central qubits system coupled with a transverse Ising spin chain. Suppose the initial state of quantum system is the Werner state and the initial state of environment is the ground state of spin chain, and the corresponding time evolution operator, decoherence factor and reduced density matrix are given. We deduce the analytical expressions of evolution of quantum coherence, entanglement and quantum discord. We find that when the spin chain undergoes quantum phase transition (QPT), the entanglement vanished at time [Formula: see text], and the coherence and discord vanished when the decoherence factor decayed to zero. Besides, we also find that the environmental scale N, coupling strength g and parameter P of Werner state do not change the evolution rules of quantum correlation, but accelerate their decay rate with these parameters’ increase.In this paper, we study the dynamical processes of quantum coherence and correlations for two central qubits system coupled with a transverse Ising spin chain. Suppose the initial state of quantum system is the Werner state and the initial state of environment is the ground state of spin chain, and the corresponding time evolution operator, decoherence factor and reduced density matrix are given. We deduce the analytical expressions of evolution of quantum coherence, entanglement and quantum discord. We find that when the spin chain undergoes quantum phase transition (QPT), the entanglement vanished at time [Formula: see text], and the coherence and discord vanished when the decoherence factor decayed to zero. Besides, we also find that the environmental scale N, coupling strength g and parameter P of Werner state do not change the evolution rules of quantum correlation, but accelerate their decay rate with these parameters’ increase.

International Journal of Modern Physics BJan 18, 20241 citation

Decoherence Effect on Quantum Correlation and Entanglement in a Two-qubit Spin Chain

Mohammad Reza Pourkarimi, Majid Rahnama, Hossein Rooholamini

arXiv:1211.5907International Journal of Theoretical PhysicsAug 21, 201425 citations

Freezing Phenomenon of Quantum Coherence for a Two-qubit System Coupled to Ising Spin Chain

Related papers

Freezing Phenomenon of Quantum Coherence for a Two-qubit System Coupled to Ising Spin Chain

Related papers