Efficient quantum simulation of photosynthetic light harvesting

Wang, Bi-Xue; Tao, Ming‐Jie; Ai, Qing; Xin, Tao; Lambert, Neill; Ruan, Dong; Cheng, Yuan‐Chung; Nori, Franco; Deng, Fu‐Guo; Long, Gui Lu

doi:10.1038/s41534-018-0102-2

Cited by 111 publications

(86 citation statements)

References 42 publications

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“…According to the study in ref. [] in this case the hierarchical equation of motion (HEOM) can treat the quantum open system in a unified way, which has recently been experimentally verified using nuclear magnetic resonance (NMR) . In this demonstration, the HEOM was exponentially accelerated by a specific mapping algorithm.…”

Section: Discussion and Summarymentioning

confidence: 96%

High‐Fidelity Universal Quantum Controlled Gates on Electron‐Spin Qubits in Quantum Dots Inside Single‐Sided Optical Microcavities

et al. 2019

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Semiconductor quantum‐dot (QD) spins hold great promise in quantum information science and technology. The implementation of high‐fidelity quantum gates on QD‐spin qubits is of great importance. Here, two schemes are presented to implement two universal quantum controlled gates, that is, the two‐qubit controlled‐not gate and the three‐qubit Toffoli gate, on stationary electron‐spin qubits in QDs inside single‐sided optical microcavities, based on the cavity‐assisted photon scattering under the balance condition. Compared with the previous schemes based on the ideal giant circular birefringence, the present schemes use the balance condition of the single‐sided QD‐cavity system, which can be achieved in both the weak‐ and strong‐coupling regimes of cavity quantum electrodynamics. Under the balance condition, the noise caused by the unbalanced reflectance between the coupled and uncoupled QD‐cavity systems can be efficiently depressed, so that the fidelity of each quantum gate operation can be increased to unity in principle. The schemes exhibit the possibility of realizing high‐fidelity and scalable quantum computing with single QD spins and single photons using the feasible and robust light–matter quantum interface. These high‐fidelity quantum controlled gates can lead to more efficient construction of quantum circuits for quantum computing, and provide a convenient avenue for quantum networking.

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Section: Discussion and Summarymentioning

confidence: 96%

High‐Fidelity Universal Quantum Controlled Gates on Electron‐Spin Qubits in Quantum Dots Inside Single‐Sided Optical Microcavities

et al. 2019

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“…Two-photon entangled states and single-photon states are used as the information carriers in our protocol, they can be prepared and controlled [47,48,49,50,51] even at a great distance. And photon states are also of great use in other fields, such as quantum computation [52,53,54,55] and quantum simulation [56,57]. We utilize the Bell measurement to deduce the final secret key.…”

Section: Discussion and Summarymentioning

confidence: 99%

High-Efficiency Three-Party Quantum Key Agreement Protocol with Quantum Dense Coding and Bell States

Wang

Zhang

et al. 2019

Int J Theor Phys

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We propose a high-efficiency three-party quantum key agreement protocol, by utilizing two-photon polarization-entangled Bell states and a few single-photon polarization states as the information carriers, and we use the quantum dense coding method to improve its efficiency. In this protocol, each participant performs one of four unitary operations to encode their sub-secret key on the passing photons which contain two parts, the first quantum qubits of Bell states and a small number of single-photon states. At the end of this protocol, based on very little information announced by other, all participants involved can deduce the same final shared key simultaneously. We analyze the security and the efficiency of this protocol, showing that it has a high efficiency and can resist both outside attacks and inside attacks. As a consequence, our protocol is a secure and efficient three-party quantum key agreement protocol.Quantum communication provides an unconditionally secure way for the transmission of information, by exploiting the principles in quantum mechanics. In recent decades, this field gains much attention of researchers all over the world. There are many important branches of quantum communication for different tasks, such as quantum key distribution (QKD) [1,2,3], quantum secure direct communication (QSDC) [4,5,6,7,8,9,10,11,12], quantum secret sharing (QSS) [13], and so on. QKD supplies a secure way for two remote legitimate parties to create a private key [1,2,3]. The parties in QKD can detect the eavesdropper, say Eve, if she monitors their quantum channel, by picking up a subset of their outcomes obtained with two nonorthogonal measuring bases to check eavesdropping. They can then discard the outcomes when they find Eve. Far different from QKD, QSDC gives an absolutely secure approach for two parties to transmit their secret message directly, without producing the private key in advance. The first QSDC scheme was proposed by Long and Liu [4] and it exploits the properties of Bell states and uses a block transmission technique in 2002. Subsequently, Deng, Long, and Liu [5] clarified the standard criterion for QSDC explicitly in 2003, and they proposed an important two-step QSDC protocol by using the Einstein-Podolsky-Rosen photon pair blocks . Recently, these two-step QSDC protocols [4,5] were experimentally implemented by two groups [6,7]. In 2004, Deng and Long [8] introduced the first QSDC protocol based on a sequence of single photons, called quantum one-time pad scheme which has been recently experimentally demonstrated by Hu et al. [9] in a noisy environment with frequency coding. In 2017, Wu et al. [10] proposed a high-capacity QSDC protocol with two-photon six-qubit hyperentangled states. QSS is used to share a secret key among some agents of a boss [13], in which the agents can reconstruct the secret if and only if they collaborate. QSS has a higher requirement than QKD because a potentially dishonest agent may injure the benefit of the boss. The inside attacks will increase largely the diffic...

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“…Figure 1 shows some examples of platforms where single-excitation stochastic networks have been successfully implemented, namely optical tweezers [25], waveguide arrays [24], superconducting circuits [26][27][28], and electrical-circuit arrays [29]. Quite recently, it has been shown that stochastic quantum networks can also be implemented in fascinating platforms, such as nuclear magnetic resonance systems [30], and ion traps [31,32].…”

Section: Single-particle Dynamicsmentioning

confidence: 99%

Two-particle quantum correlations in stochastically-coupled networks

et al. 2019

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Quantum walks in dynamically-disordered networks have become an invaluable tool for understanding the physics of open quantum systems. Although much work has been carried out considering networks affected by diagonal disorder, it is of fundamental importance to study the effects of fluctuating couplings. This is particularly relevant in materials science models, where the interaction forces may change depending on the species of the atoms being linked. In this work, we make use of stochastic calculus to derive a master equation for the dynamics of one and two non-interacting correlated particles in tight-binding networks affected by off-diagonal dynamical disorder. We show that the presence of noise in the couplings of a quantum network creates a pure-dephasing-like process that destroys all coherences in the single-particle Hilbert subspace. Moreover, we show that when two or more correlated particles propagate in the network, coherences accounting for particle indistinguishability are robust against the impact of off-diagonal noise, thus showing that it is possible, in principle, to find specific conditions for which many indistinguishable particles can traverse stochastically-coupled networks without losing their ability to interfere.

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Efficient quantum simulation of photosynthetic light harvesting

Cited by 111 publications

References 42 publications

High‐Fidelity Universal Quantum Controlled Gates on Electron‐Spin Qubits in Quantum Dots Inside Single‐Sided Optical Microcavities

High‐Fidelity Universal Quantum Controlled Gates on Electron‐Spin Qubits in Quantum Dots Inside Single‐Sided Optical Microcavities

High-Efficiency Three-Party Quantum Key Agreement Protocol with Quantum Dense Coding and Bell States

Two-particle quantum correlations in stochastically-coupled networks

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