Decoherence from an antiferromagnetic environment

Yuan, Xiao-Zhong; Zhu, Ka-Di

doi:10.1209/epl/i2004-10448-2

Cited by 17 publications

(23 citation statements)

References 25 publications

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“…Based on these results Wilkie has speculated [35] that some sort of transition occurs with increasing temperature; a chaotic bath could cause less decoherence at low temperature and greater decoherence at high temperature. This conjecture would be consistent with the spin-bath results [4,6,[8][9][10][11][12][13][14] and would not be in direct conflict with the oscillator calculation [5]. However, the existence of such a transition is difficult to verify in exact spin-bath or oscillator-bath calculations.…”

Section: Introductionsupporting

confidence: 76%

Temperature crossover of decoherence rates in chaotic and regular bath dynamics

2012

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The effect of chaotic bath dynamics on the decoherence of a quantum system is examined for the vibrational degrees of freedom of a diatomic molecule in a realistic, constant temperature collisional bath. As an example, the specific case of I(2) in liquid xenon is examined as a function of temperature, and the results compared with an integrable xenon bath. A crossover in behavior is found: The integrable bath induces more decoherence at low bath temperatures than does the chaotic bath, whereas the opposite is the case at the higher bath temperatures. These results, verifying a conjecture due to Wilkie, shed light on the differing views of the effect of chaotic dynamics on system decoherence.

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Section: Introductionsupporting

confidence: 76%

Temperature crossover of decoherence rates in chaotic and regular bath dynamics

2012

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“…where H S , H B are the Hamiltonians of the central spin and the environment respectively, and H SB is the coupling term [17,18,33,45]. They can be written as…”

Section: Model and Spin Wave Approximationmentioning

confidence: 99%

“…This decoherence problem of a central spin in an antiferromagnetic environment has been investigated in Ref. [33]. A similar problem of a spin-1/2 impurity embedded in an antiferromagnetic environment has been studied in the context of quantum frustration of decoherence in Ref.…”

Section: Introductionmentioning

confidence: 99%

Influence of an external magnetic field on the decoherence of a central spin coupled to an antiferromagnetic environment

2007

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Using the spin wave approximation, we study the decoherence dynamics of a central spin coupled to an antiferromagnetic environment under the application of an external global magnetic field. The external magnetic field affects the decoherence process through its effect on the antiferromagnetic environment. It is shown explicitly that the decoherence factor which displays a Gaussian decay with time depends on the strength of the external magnetic field and the crystal anisotropy field in the antiferromagnetic environment. When the values of the external magnetic field is increased to the critical field point at which the spin-flop transition (a first-order quantum phase transition) happens in the antiferromagnetic environment, the decoherence of the central spin reaches its highest point. This result is consistent with several recent quantum phase transition witness studies. The influences of the environmental temperature on the decoherence behavior of the central spin are also investigated.

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“…Recent work suggests that the internal dynamics of the environment can be crucial to the decoherence of the central system. [3][4][5][6][7][8][9][10][11][12][13][14][15] In this paper, we present results of extensive simulation work of a two-spin system interacting with a spin-bath environment and show that the decoherence of the two-spin system can exhibit different behaviors, depending on the characteristics of the coupling with the environment, the internal dynamics, and the initial state of the latter. We also provide a simple physical picture to understand this behavior.…”

Section: Introductionmentioning

confidence: 99%

Decoherence by a spin thermal bath: Role of spin-spin interactions and initial state of the bath

2008

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We study the decoherence of two coupled spins that interact with a spin-bath environment. It is shown that the connectivity and the coupling strength between the spins in the environment are of crucial importance for the decoherence of the central system. For the anisotropic spin-bath, changing the connectivity or coupling strenghts changes the decoherence of the central system from Gaussian to exponential decay law. The initial state of the environment is shown to affect the decoherence process in a qualitatively significant manner.

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Decoherence from an antiferromagnetic environment

Cited by 17 publications

References 25 publications

Temperature crossover of decoherence rates in chaotic and regular bath dynamics

Temperature crossover of decoherence rates in chaotic and regular bath dynamics

Influence of an external magnetic field on the decoherence of a central spin coupled to an antiferromagnetic environment

Decoherence by a spin thermal bath: Role of spin-spin interactions and initial state of the bath

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