Decoherence-assisted energy transfer and quantum criticalities

Giorgi, Gian Luca; Busch, Thomas

doi:10.1103/physreva.86.052112

Cited by 6 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This idea has recently been extended to the study of the noise-induced properties of a twolevel system in a spin bath which undergoes a quantum phase transition [30]. Here, we extend the model of decoherence-assisted transport to more complex networks.…”

Section: Decoherence-assisted Transportmentioning

confidence: 99%

See 1 more Smart Citation

Decoherence-assisted transport in quantum networks

et al. 2013

View full text Add to dashboard Cite

It is shown that energy transfer in a homogeneous fully connected quantum network is assisted by a decohering interaction with environmental spins. Analytic expressions for the transfer probabilities are obtained for the zero temperature case, and the effect is shown to persist at physiological temperatures. This model of decoherence-assisted energy transfer is applied to the Fenna-Matthews-Olson complex.

show abstract

Section: Decoherence-assisted Transportmentioning

confidence: 99%

“…transfer probabilities of over 85% can be achieved at 300K. This idea has recently been extended to the study of the noise-induced properties of a two-level system in a spin bath which undergoes a quantum phase transition [30].…”

Section: Decoherence-assisted Transportmentioning

confidence: 99%

Decoherence-assisted transport in quantum networks

et al. 2013

View full text Add to dashboard Cite

show abstract

“…To deal with this, we here show that the sensitivity to systematic parameter errors can be reduced by letting the system interact with a structured environment. Our approach is inspired by earlier findings [29][30][31] that transport efficiency in quantum systems can be enhanced in such environments.We modify the off-resonant non-adiabatic holonomic scheme by coupling the auxiliary state to a finite thermal bath, the latter playing the role of the structured environment. The key point of our modified scheme is its non-Markovian nature.This allows for coherence to flow back and forth between the system and the environmental bath, a feature that has been shown to prolong coherence [32,33], and can be used for quantum control [34,35] in open quantum systems.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Environment-Assisted Holonomic Quantum Maps

Ramberg

Sjöqvist

2019

Phys. Rev. Lett.

View full text Add to dashboard Cite

Holonomic quantum computation uses non-Abelian geometric phases to realize error resilient quantum gates. Nonadiabatic holonomic gates are particularly suitable to avoid unwanted decoherence effects, as they can be performed at high speed. By letting the computational system interact with a structured environment, we show that the scope of error resilience of nonadiabatic holonomic gates can be widened to include systematic parameter errors. Our scheme maintains the geometric properties of the evolution and results in an environmentassisted holonomic quantum map that can mimic the effect of a holonomic gate. We demonstrate that the sensitivity to systematic errors can be reduced in a proof-of-concept spin-bath model.Quantum holonomies are non-Abelian (non-commuting) unitary operators that only depend on paths in state space of a quantum system. The non-commuting property makes them useful for implementing quantum gates that manipulate quantum information by purely geometric means. Holonomic quantum computation (HQC) [1] is a network of holonomic gates that unifies geometric characteristics of quantum systems and information processing, as well as is conjectured to be robust to errors in experimental control parameters [2].Nonadiabatic HQC has recently been proposed [3] and experimentally implemented [4-9] as a tool to realize quantum gates based upon nonadiabatic non-Abelian geometric phases [10]. The basic setup for nonadiabatic HQC in [3] is a threelevel Λ configuration, where two simultaneous resonant laser pulses drive transitions between the qubit levels and an auxiliary state level. This scheme has been generalized to offresonant pulses [11,12]. The off-resonant setup uses two simultaneous laser pulses with the same variable detuning, which enhances the flexibility of the holonomic scheme. For experimental realization of off-resonant nonadiabatic holonomic gates, see Refs. [13][14][15][16].The nonadiabatic version of HQC avoids the drawback of the long run time associated with adiabatic holonomies [17], on which the original holonomic schemes are based [1,18]. Nonadiabatic holonomic gates are therefore particularly suitable to avoid unwanted decoherence effects [19]. The resilience to decoherence errors can be further improved by combining nonadiabatic HQC with decoherence-free subspaces [20-23] and subsystems [24], as well as dynamical decoupling [25-27]. On the other hand, it has been pointed out [28] that the original version of nonadiabatic HQC has no particular advantage compared to standard dynamical schemes in the presence of systematic errors in experimental parameters. To deal with this, we here show that the sensitivity to systematic parameter errors can be reduced by letting the system interact with a structured environment. Our approach is inspired by earlier findings [29][30][31] that transport efficiency in quantum systems can be enhanced in such environments.We modify the off-resonant non-adiabatic holonomic scheme by coupling the auxiliary state to a finite thermal bath, the latter playing t...

show abstract

“…A more realistic type of environment takes the form of quantum interacting spin chains [3,[30][31][32][33][34][35], where the decay of the qubit's coherence is found to be related to the critical properties of the spin environments. Most prior work making use of such an environment considered qubit-spin bath coupling of the Ising form, which is spin conserving.…”

Section: Introductionmentioning

confidence: 99%

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

Nanduri

Rabitz

2014

Phys. Rev. A

View full text Add to dashboard Cite

We examine the influence of environmental interactions on simple quantum systems by obtaining the exact reduced dynamics of a qubit coupled to a one-dimensional spin bath. In contrast to previous studies, both the qubit-bath coupling and the nearest neighbor intrabath couplings are taken as the spin-flip XX-type. We first study the Rabi oscillations of a single qubit with the spin bath prepared in a spin coherent state, finding that nonresonance and finite intrabath interactions have significant effects on the qubit dynamics. Next, we discuss the bath-induced decoherence of the qubit when the bath is initially in the ground state, and show that the decoherence properties depend on the internal phases of the spin bath. By considering two independent copies of the qubitbath system, we finally probe the disentanglement dynamics of two noninteracting entangled qubits. We find that entanglement sudden death appears when the spin bath is in its critical phase. We show that the single-qubit decoherence factor is an upper bound for the two-qubit concurrence.

show abstract

Decoherence-assisted energy transfer and quantum criticalities

Cited by 6 publications

References 24 publications

Decoherence-assisted transport in quantum networks

Decoherence-assisted transport in quantum networks

Environment-Assisted Holonomic Quantum Maps

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

Contact Info

Product

Resources

About