Rabi oscillations, decoherence, and disentanglement in a qubit–spin-bath system

Wu, Ning; Nanduri, Arun; Rabitz, Herschel

doi:10.1103/physreva.89.062105

Cited by 28 publications

(38 citation statements)

References 73 publications

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“…The study of the decoherence dynamics of a single spin attached to a bath has a long history [25][26][27][28][29][30][31][32] . In particular, the roles of soft modes close to second order phase transition 27,33 , or the presence of a non-vanishing order-parameter in the bath have been studied in depth.…”

Section: Introductionmentioning

confidence: 99%

Single spin probe of many-body localization

2016

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We use an external spin as a dynamical probe of many body localization. The probe spin is coupled to an interacting and disordered environment described by a Heisenberg spin chain in a random field. The spin-chain environment can be tuned between a thermalizing delocalized phase and non-thermalizing localized phase, both in its ground-and high-energy states. We study the decoherence of the probe spin when it couples to the environment prepared in three states: the groundstate, the infinite temperature state and a high energy Néel state. In the non-thermalizing many body localized regime, the coherence shows scaling behaviour in the disorder strength. The long-time dynamics of the probe spin shows a logarithmic dephasing in analogy with the logarithmic growth of entanglement entropy for a bi-partition of a many-body localized system. In summary, we show that decoherence of the probe spin provides clear signatures of many-body localization.

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Section: Introductionmentioning

confidence: 99%

Single spin probe of many-body localization

2016

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“…As other quantum systems, realistic spin systems are not isolated and they are inevitably influenced by their surrounding environments [4][5][6], especially the spin environments [7][8][9][10][11][12]. As a result, their entanglement and coherence will be irretrievably lost, even vanished [9][10][11].…”

Section: Introductionmentioning

confidence: 95%

Entanglement Dynamics of Two Spins in Initially Correlated Wheel-Shaped Spin Baths

et al. 2015

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We study the effects of the initial correlations in environment on the entanglement dynamics of spin system. The correlated environment is novelly simulated by two correlated wheel-shaped spin baths, each consisting of an intermediate spin interacting with a spin-ring. The correlations in environment are achieved by the entanglement between two intermediate spins. The spin system includes two system-spins, and the interaction between the spin system and the environment is implemented by the coupling between the systemspin and the intermediate spin. Firstly, we analyze the influences of the initial entanglement between the two intermediate spins, the coupling parameters and the temperature of the baths on the entanglement dynamics of the two system-spins in equivalent subsystems. It is demonstrated that the initial entanglement between the baths can act as a resource for the generation and the revivals of the entanglement of the system-spins. Moreover, the amount of the generation and the revivals of the entanglement of the system-spins can be enhanced by regulating the coupling constants and the temperature of the baths. In addition, we also investigate the influences of different coupling ratios in non-equivalent subsystems, it is found that changing the coupling ratios of two subsystems has a significant effect on the generation and revivals of entanglement of system-spins.

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“…The above analysis relies on universal dynamics of phase transitions. A more systematic approach to suppress excitations is based on recasting the minimization problem as a standard problem in optimal control theory [92], a strategy explored in a recent series of works [93,59,40,94,95,96]. Assume a quantum system with a Hamiltonian of the form H 0 = i=1,N λ i h i where h i are local operators with dimensions of energy and λ i are the corresponding dimensionless couplings.…”

Section: Optimal Control Methodsmentioning

confidence: 99%

Controlling quantum critical dynamics of isolated systems

Campo

Sengupta

2015

Eur. Phys. J. Spec. Top.

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Abstract. Controlling the non adiabatic dynamics of isolated quantum systems driven through a critical point is of interest in a variety of fields ranging from quantum simulation to finite-time thermodynamics. We briefly review the different methods for designing protocols which minimize excitation (defect) production in a closed quantum critical system driven out of equilibrium. We chart out the role of specific driving schemes for this procedure, point out their experimental relevance, and discuss their implementation in the context of ultracold atom and spin systems.

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Rabi oscillations, decoherence, and disentanglement in a qubit–spin-bath system

Cited by 28 publications

References 73 publications

Single spin probe of many-body localization

Single spin probe of many-body localization

Entanglement Dynamics of Two Spins in Initially Correlated Wheel-Shaped Spin Baths

Controlling quantum critical dynamics of isolated systems

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