Stabilizing spin coherence through environmental entanglement in strongly dissipative quantum systems

Bera, Soumya; Florens, Serge; Baranger, Harold U.; Roch, Nicolas; Nazir, Ahsan; Chin, Alex W.

doi:10.1103/physrevb.89.121108

Cited by 71 publications

(155 citation statements)

References 45 publications

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“…Very recently, a systematic coherent-state expansion of the ground state wave function that is based on the Davydov D 1 Ansatz, which we shall call the "multi-D 1 Ansatz," is developed for a number of models [59][60][61]. It is a generalization of a variational wave function originally proposed by Silbey and Harris [62], and also an extension of the hierarchy of translationlly-invariant Ansätze proposed by Zhao et al [48,49] A jnq…”

Section: Discussionmentioning

confidence: 99%

Polaron dynamics with a multitude of Davydov D2 trial states

Zhou

Huang

Zhu

et al. 2015

The Journal of Chemical Physics

121

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We propose an extension to the Davydov D2 Ansatz in the dynamics study of the Holstein molecular crystal model with diagonal and off-diagonal exciton-phonon coupling using the Dirac-Frenkel time-dependent variational principle. The new trial state by the name of the "multi-D2 Ansatz" is a linear combination of Davydov D2 trial states, and its validity is carefully examined by quantifying how faithfully it follows the Schrödinger equation. Considerable improvements in accuracy have been demonstrated in comparison with the usual Davydov trial states, i.e., the single D1 and D2 Ansätze. With an increase in the number of the Davydov D2 trial states in the multi-D2 Ansatz, deviation from the exact Schrödinger dynamics is gradually diminished, leading to a numerically exact solution to the Schrödinger equation.

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Section: Discussionmentioning

confidence: 99%

Polaron dynamics with a multitude of Davydov D2 trial states

Zhou

Huang

Zhu

et al. 2015

The Journal of Chemical Physics

121

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“…Nevertheless, theoretical investigations have been mainly focused on the dissipative dynamics of the spin-boson model [11][12][13][14][15][16][17].…”

Section: J Stat Mech (2016) 054016mentioning

confidence: 99%

Quantum dissipative dynamics of a bistable system in the sub-Ohmic to super-Ohmic regime

Magazzù¹,

Carollo²,

Spagnolo³

et al. 2016

J. Stat. Mech.

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Abstract. We investigate the quantum dynamics of a multilevel bistable system coupled to a bosonic heat bath beyond the perturbative regime. We consider dierent spectral densities of the bath, in the transition from subOhmic to super-Ohmic dissipation, and dierent cuto frequencies. The study is carried out by using the real-time path integral approach of the FeynmanVernon influence functional. We find that, in the crossover dynamical regime characterized by damped intrawell oscillations and incoherent tunneling, the short time behavior and the time scales of the relaxation starting from a nonequilibrium initial condition depend nontrivially on the spectral properties of the heat bath.

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“…This resembles the polaron in condensed matter, where the electron is surrounded with photons that are induced by deviation of atoms from their equilibrium positions. Thus, these right (x 0 ) and left (−x 0 ) displaced states can be considered as polarons [17,18,55]. The polaron located at x 0 is bounded to |− z and that located at −x 0 is bounded to |+ z .…”

Section: Overweighted Anti-polaron and Its Mechanism In The Rabimentioning

confidence: 99%

“…[9]) but also in a variety of other fields such as, for example, BoseEinstein condensation [10,11], nanoscience [12], biophysics [13], polymers [14][15][16], and so on. Recently, it has also been extended to study spin coherence [17,18] in a dissipative quantum system, namely, the spin-boson model [19,20]. While these works [17,18] have focused on the dissipative environment, the physics of polarons in a single-mode optical field have not been explored systematically.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, it has also been extended to study spin coherence [17,18] in a dissipative quantum system, namely, the spin-boson model [19,20]. While these works [17,18] have focused on the dissipative environment, the physics of polarons in a single-mode optical field have not been explored systematically. In fact, a two-level atom (qubit) coupled to a single-mode optical field is the simplest system describing the interaction between light and matter, which is a basic model in quantum optics [21,22], quantum information [23], and condensed matter physics [24].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The asymmetric quantum Rabi model in the polaron picture

Liu

Ying

et al. 2017

J. Phys. A: Math. Theor.

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The concept of the polaron in condensed matter physics has been extended to the Rabi model, where polarons resulting from the coupling between a two-level system and single-mode photons represent two oppositely displaced oscillators. Interestingly, tunneling between these two displaced oscillators can induce an anti-polaron, which has not been systematically explored in the literature, especially in the presence of an asymmetric term. In this paper, we present a systematic analysis of the competition between the polaron and anti-polaron under the interplay of the coupling strength and the asymmetric term. While intuitively the anti-polaron should be secondary owing to its higher potential energy, we find that, under certain conditions, the minor anti-polaron may gain a reversal in the weight over the major polaron. If the asymmetric amplitude ǫ is smaller than the harmonic frequency ω, such an overweighted anti-polaron can occur beyond a critical value of the coupling strength g; if ǫ is larger, the anti-polaron can even be always overweighted at any g. We propose that the explicit occurrence of the overweighted anti-polaron can be monitored by a displacement transition from negative to positive values. This displacement is an experimentally accessible observable, which can be measured by quantum optical methods, such as balanced Homodyne detection.

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Stabilizing spin coherence through environmental entanglement in strongly dissipative quantum systems

Cited by 71 publications

References 45 publications

Polaron dynamics with a multitude of Davydov D2 trial states

Polaron dynamics with a multitude of Davydov D2 trial states

Quantum dissipative dynamics of a bistable system in the sub-Ohmic to super-Ohmic regime

The asymmetric quantum Rabi model in the polaron picture

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