The Experts below are selected from a list of 48972 Experts worldwide ranked by ideXlab platform
Graham R Fleming - One of the best experts on this subject based on the ideXlab platform.
-
Quantum Coherence in photosynthetic light harvesting
Annual Review of Condensed Matter Physics, 2012Co-Authors: Akihito Ishizaki, Graham R FlemingAbstract:Recent two-dimensional (2D) electronic spectroscopic experiments revealed that electronic energy transfer in photosynthetic light harvesting involves long-lived Quantum Coherence among electronic excitations of pigments. These findings have led to the suggestion that Quantum Coherence might play a role in achieving the remarkable Quantum efficiency of photosynthetic light harvesting. Further, this speculation has led to much effort being devoted to elucidation of the Quantum mechanisms of the photosynthetic excitation energy transfer (EET). In this review, we provide an overview of recent experimental and theoretical investigations of photosynthetic electronic energy transfer, specifically addressing underlying mechanisms of the observed long-lived Coherence and its potential roles in photosynthetic light harvesting. We close with some thoughts on directions for future developments in this area.
-
Quantum Coherence and its interplay with protein environments in photosynthetic electronic energy transfer
Physical Chemistry Chemical Physics, 2010Co-Authors: Akihito Ishizaki, Tessa R Calhoun, Gabriela S Schlaucohen, Graham R FlemingAbstract:Recent experiments suggest that electronic energy transfer in photosynthetic pigment-protein complexes involves long-lived Quantum Coherence among electronic excitations of pigments. [Engel et al., Nature, 2007, 446, 782–786.] The observation has led to the suggestion that Quantum Coherence might play a significant role in achieving the remarkable efficiency of photosynthetic light harvesting. At the same time, the observation has raised questions regarding the role of the surrounding protein in protecting the Quantum Coherence. In this Perspective, we provide an overview of recent experimental and theoretical investigations of photosynthetic electronic energy transfer paying particular attention to the underlying mechanisms of long-lived Quantum Coherence and its non-Markovian interplay with the protein environment.
Cheng-cheng Liu - One of the best experts on this subject based on the ideXlab platform.
-
Quantum Coherence, uncertainty, nonlocal advantage of Quantum Coherence as indicators of Quantum phase transition in the transverse Ising model
Laser Physics Letters, 2017Co-Authors: Cheng-cheng Liu, Dong Wang, Wen-yang SunAbstract:In this paper, we investigate the relation among local Quantum Coherence, Quantum uncertainty, and the nonlocal advantage of Quantum Coherence based on skew information and Quantum phase transition in the transverse Ising model by exploring the Quantum renormalization group (QRG) method. The results reveal that the amount of the local Quantum uncertainty is equal to the local Quantum Coherence corresponding to the local observable in the model, which can be generalized to a multipartite system. Moreover, the nonlocal advantage of Quantum Coherence is investigated, and we found that regardless of the value of the external magnet field and the number of QRG iterations, the Quantum Coherence of the subsystem was steerable, which is not only suitable for the two sites of the block, but also for the nearest-neighbor blocks in the long-ranged ferromagnetic phase. However, as the system becomes large enough, the Quantum Coherence of the subsystem is not steerable in the paramagnetic phase. Additionally, the QRG implementation of Quantum Coherence and uncertainty are effective and feasible to detect the Quantum critical points associated with Quantum phase transitions. We also make use of the QRG method to analyze the thermodynamic limit of the current model and the emergence of the nonanalytic and scaling behaviors of the nonlocal advantage of Quantum Coherence.
-
Probing Quantum Coherence, uncertainty, steerability of Quantum Coherence and Quantum phase transition in the spin model
Quantum Information Processing, 2017Co-Authors: Cheng-cheng LiuAbstract:In this paper, we study the relation among Quantum Coherence, uncertainty, steerability of Quantum Coherence based on skew information and Quantum phase transition in the spin model by employing Quantum renormalization-group method. Interestingly, the results show that the value of the local Quantum uncertainty is equal to the local Quantum Coherence corresponding to local observable $$\sigma _z$$?z in XXZ model, and unlikely in XY model, local Quantum uncertainty is minimal optimization of the local Quantum Coherence over local observable $$\sigma _x$$?x and this proposition can be generalized to a multipartite system. Therefore, one can directly achieve Quantum correlation measured by local Quantum uncertainty and Coherence by choosing different local observables $$\sigma _x$$?x, $$\sigma _z$$?z, corresponding to the XY model and XXZ model separately. Meanwhile, steerability of Quantum Coherence in XY and XXZ model is investigated systematically, and our results reveal that no matter what times the QRG iterations are carried out, the Quantum Coherence of the state of subsystem cannot be steerable, which can also be suitable for block---block steerability of local Quantum Coherence in both XY and XXZ models. On the other hand, we have illustrated that the Quantum Coherence and uncertainty measure can efficiently detect the Quantum critical points associated with Quantum phase transitions after several iterations of the renormalization. Moreover, the nonanalytic and scaling behaviors of steerability of local Quantum Coherence have been also taken into consideration.
Akihito Ishizaki - One of the best experts on this subject based on the ideXlab platform.
-
Quantum Coherence in photosynthetic light harvesting
Annual Review of Condensed Matter Physics, 2012Co-Authors: Akihito Ishizaki, Graham R FlemingAbstract:Recent two-dimensional (2D) electronic spectroscopic experiments revealed that electronic energy transfer in photosynthetic light harvesting involves long-lived Quantum Coherence among electronic excitations of pigments. These findings have led to the suggestion that Quantum Coherence might play a role in achieving the remarkable Quantum efficiency of photosynthetic light harvesting. Further, this speculation has led to much effort being devoted to elucidation of the Quantum mechanisms of the photosynthetic excitation energy transfer (EET). In this review, we provide an overview of recent experimental and theoretical investigations of photosynthetic electronic energy transfer, specifically addressing underlying mechanisms of the observed long-lived Coherence and its potential roles in photosynthetic light harvesting. We close with some thoughts on directions for future developments in this area.
-
Quantum Coherence and its interplay with protein environments in photosynthetic electronic energy transfer
Physical Chemistry Chemical Physics, 2010Co-Authors: Akihito Ishizaki, Tessa R Calhoun, Gabriela S Schlaucohen, Graham R FlemingAbstract:Recent experiments suggest that electronic energy transfer in photosynthetic pigment-protein complexes involves long-lived Quantum Coherence among electronic excitations of pigments. [Engel et al., Nature, 2007, 446, 782–786.] The observation has led to the suggestion that Quantum Coherence might play a significant role in achieving the remarkable efficiency of photosynthetic light harvesting. At the same time, the observation has raised questions regarding the role of the surrounding protein in protecting the Quantum Coherence. In this Perspective, we provide an overview of recent experimental and theoretical investigations of photosynthetic electronic energy transfer paying particular attention to the underlying mechanisms of long-lived Quantum Coherence and its non-Markovian interplay with the protein environment.
Heng Fan - One of the best experts on this subject based on the ideXlab platform.
-
Quantum Coherence in a Quantum heat engine
Journal of Physics A: Mathematical and Theoretical, 2020Co-Authors: Yun-hao Shi, Hai-long Shi, Xiao-hui Wang, Si-yuan Liu, Wen-li Yang, Heng FanAbstract:We identify that Quantum Coherence is a valuable resource in the Quantum heat engine, which is designed in a Quantum thermodynamic cycle assisted by a Quantum Maxwell's demon. This demon is in a superposed state. The Quantum work and heat are redefined as the sum of coherent and incoherent parts in the energy representation. The total Quantum work and the corresponding efficiency of the heat engine can be enhanced due to the Coherence consumption of the demon. In addition, we discuss an universal information heat engine driven by Quantum Coherence. The extractable work of this heat engine is limited by the Quantum Coherence, even if it has no classical thermodynamic cost. This resource-driven viewpoint provides a direct and effective way to clarify the thermodynamic processes where the coherent superposition of states cannot be ignored.
-
Quantum Coherence and geometric Quantum discord
Physics Reports, 2018Co-Authors: Jieci Wang, Yu-ran Zhang, Yi Peng, Heng FanAbstract:Abstract Quantum Coherence and Quantum correlations are of fundamental and practical significance for the development of Quantum mechanics. They are also cornerstones of Quantum computation and Quantum communication theory. Searching physically meaningful and mathematically rigorous quantifiers of them are long-standing concerns of the community of Quantum information science, and various faithful measures have been introduced so far. We review in this paper the measures of discordlike Quantum correlations for bipartite and multipartite systems, the measures of Quantum Coherence for any single Quantum system, and their relationship in different settings. Our aim is to provide a full review about the resource theory of Quantum Coherence, including its application in many-body systems, and the discordlike Quantum correlations which were defined based on the various distance measures of states. We discuss the interrelations between Quantum Coherence and Quantum correlations established in an operational way, and the fundamental characteristics of Quantum Coherence such as their complementarity under different basis sets, their duality with path information of an interference experiment, their distillation and dilution under different operations, and some new viewpoints of the superiority of the Quantum algorithms from the perspective of Quantum Coherence. Additionally, we review properties of geometric Quantum correlations and Quantum Coherence under noisy Quantum channels. Finally, the main progresses for the study of Quantum correlations and Quantum Coherence in the relativistic settings are reviewed. All these results provide an overview for the conceptual implications and basic connections of Quantum Coherence, Quantum correlations, and their potential applications in various related subjects of physics.
-
Relative Quantum Coherence, incompatibility, and Quantum correlations of states
Physical Review A, 2017Co-Authors: Heng FanAbstract:Quantum Coherence, incompatibility, and Quantum correlations are fundamental features of Quantum physics. A unified view of those features is crucial for revealing quantitatively their intrinsic connections. We define the relative Quantum Coherence of two states as the Coherence of one state in the reference basis spanned by the eigenvectors of another one and establish its quantitative connections with the extent of mutual incompatibility of two states. We also show that the proposed relative Quantum Coherence, which can take any form of measures such as $l_1$ norm and relative entropy, can be interpreted as or connected to various Quantum correlations such as Quantum discord, symmetric discord, entanglement of formation, and Quantum deficits. Our results reveal conceptual implications and basic connections of Quantum Coherence, mutual incompatibility, and Quantum correlations.
-
Quantum Coherence and Quantum correlations
2017Co-Authors: Yi Peng, Yu-ran Zhang, Heng FanAbstract:Quantum Coherence and Quantum correlations are of fundamental and practical significance for the development of Quantum mechanics.They are also cornerstones of Quantum computation and Quantum communication theory. Searching physically meaningful and mathematically rigorous quantifiers of them are long-standing concerns of the community of Quantum information science, and various faithful measures have been introduced so far. We review in this paper the measures of discordlike Quantum correlations for bipartite and multipartite systems, the measures of Quantum Coherence for any single Quantum system, and their relationship in different settings. Our aim is to provide a full review about the resource theory of Quantum Coherence, including its application in many-body systems, and the discordlike Quantum correlations which were defined based on the various distance measures of states. We discuss the interrelations between Quantum Coherence and Quantum correlations established in an operational way, and the fundamental characteristics of Quantum Coherence such as their complementarity under different basis sets, their duality with path information of an interference experiment, their distillation and dilution under different operations, and some new viewpoints of the superiority of the Quantum algorithms from the perspective of Quantum Coherence. Additionally, we review properties of geometric Quantum correlations and Quantum Coherence under noisy Quantum channels. Finally, the main progresses for the study of Quantum correlations and Quantum Coherence in the relativistic settings are reviewed. All these results provide an overview for the conceptual implications and basic connections of Quantum Coherence, Quantum correlations, and their potential applications in various related subjects of physics.
-
Irreversible degradation of Quantum Coherence under relativistic motion
Physical Review A, 2016Co-Authors: Jieci Wang, Zehua Tian, Jiliang Jing, Heng FanAbstract:We study the dynamics of Quantum Coherence under Unruh thermal noise and seek under which condition the Coherence can be frozen in a relativistic setting. We find that the frozen condition is either (i) the initial state is prepared as an inCoherence state or (ii) the detectors have no interaction with the external field. That is to say, the deCoherence of the detectors' Quantum state is irreversible under the influence of thermal noise induced by Unruh radiation. It is shown that Quantum Coherence approaches zero only in the limit of an infinite acceleration, while Quantum entanglement could reduce to zero for a finite acceleration. It is also demonstrated that the robustness of Quantum Coherence is better than entanglement under the influence of the atom-field interaction for an extremely large acceleration. Therefore, Quantum Coherence is more robust than entanglement in an accelerating system and the Coherence-type Quantum resources are more accessible for relativistic Quantum information processing tasks.
L. F. Wei - One of the best experts on this subject based on the ideXlab platform.
-
Quantifying Quantum Coherence with Quantum Fisher information
Scientific reports, 2017Co-Authors: Xiao Feng, L. F. WeiAbstract:Quantum Coherence is one of the old but always important concepts in Quantum mechanics, and now it has been regarded as a necessary resource for Quantum information processing and Quantum metrology. However, the question of how to quantify the Quantum Coherence has just been paid the attention recently (see, e.g., Baumgratz et al. PRL, 113. 140401 (2014)). In this paper we verify that the well-known Quantum Fisher information (QFI) can be utilized to quantify the Quantum Coherence, as it satisfies the monotonicity under the typical incoherent operations and the convexity under the mixing of the Quantum states. Differing from most of the pure axiomatic methods, quantifying Quantum Coherence by QFI could be experimentally testable, as the bound of the QFI is practically measurable. The validity of our proposal is specifically demonstrated with the typical phase-damping and depolarizing evolution processes of a generic single-qubit state, and also by comparing it with the other quantifying methods proposed previously.
