Coherent electron wavepacket propagation and entanglement in array of coupled quantum dots

Nikolopoulos, Georgios M.; Petrosyan, David; Lambropoulos, P.

doi:10.1209/epl/i2003-10100-9

Cited by 114 publications

(152 citation statements)

References 31 publications

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“…[5,6,7]. Thus such a specialized piece of architecture is probably useful only for very specific tasks at particular points during computation, transfer, and storage.…”

Section: A Router For Quantum Informationmentioning

confidence: 99%

“…Such perfect entanglement transfer can be achieved by specific static couplings [5,6,7]. The question is now whether time-dependent fields allow one to route the qubit in a controlled manner from the node of the Tjunction to either Bob or Charlie.…”

Section: A Entanglement Routingmentioning

confidence: 99%

“…While long distance quantum communication can be done quite efficiently with photons [2], communication inside a quantum computer will probably use linearly arranged solid-state qubits [3,4]. Lately, much attention has been paid to spin chains with nearest neighbor coupling, which allow for perfect transfer of quantum information [5,6,7,8]. The simplicity of such chains and the fact that they do not require special control make them robust for experimental implementations [9].…”

Section: Introductionmentioning

confidence: 99%

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Quantum router based on ac control of qubit chains

et al. 2009

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We study the routing of quantum information in qubit chains. This task is achieved by suitably chosen time-dependent local fields acting on the qubits. Employing the physics of coherent destruction of tunneling, we demonstrate that a driving-induced renormalization of the coupling between neighboring qubits provides the key for controlling the transduction of quantum information between permanently coupled qubits. We employ this idea for building a quantum router. Moreover, we discuss the experimental implementation with Penning traps, and study the robustness of our protocol under realistic experimental conditions, such as fabrication uncertainties and decoherence.

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“…[5,6,7]. Thus such a specialized piece of architecture is probably useful only for very specific tasks at particular points during computation, transfer, and storage.…”

Section: A Router For Quantum Informationmentioning

confidence: 99%

Section: A Entanglement Routingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum router based on ac control of qubit chains

et al. 2009

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“…[4,5,6,7,8,9,10,11]. To gain, however, further insight into the problem of concatenating a number of given PST links, and the possible limitations one may face while looking for solutions, we have to become more specific.…”

Section: Concatenation Of Pp Pst Linksmentioning

confidence: 99%

“…Passive quantum networks, where the nodes have fixed energies and are permanently coupled, are of particular interest since they do not require any external control associated with the application of multiple gates and/or measurements. In this spirit, various Hamiltonians have been proposed which allow for PST from one node to another [4,5,6,7,8,9,10,11]. In such a PP logical topology, the other nodes provide the backbone (or bus), for the communication between the source and the destination nodes.…”

Section: Introductionmentioning

confidence: 99%

Communication in quantum networks of logical bus topology

Brougham¹,

Nikolopoulos

Jex³

2009

Phys. Rev. A

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Perfect state transfer (PST) is discussed in the context of passive quantum networks with logical bus topology, where many logical nodes communicate using the same shared media, without any external control. The conditions under which, a number of point-to-point PST links may serve as building blocks for the design of such multi-node networks are investigated. The implications of our results are discussed in the context of various Hamiltonians that act on the entire network, and are capable of providing PST between the logical nodes of a prescribed set in a deterministic manner.

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Landau–Zener Topological Quantum State Transfer

2019

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Fast and robust quantum state transfer (QST) is a major requirement in quantum control and in scalable quantum information processing. Topological protection has emerged as a promising route for the realization of QST robust against sizable imperfections in the network. Here, a scheme is presented for robust QST of topologically protected edge states in a dimeric Su-Schrieffer-Heeger spin chain assisted by Landau-Zener tunneling. As compared to topological QST protocols based on Rabi flopping proposed in recent works, the method is more advantageous in terms of robustness against both diagonal and off-diagonal disorder in the chain, without a substantial increase of the interaction time.

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Coherent electron wavepacket propagation and entanglement in array of coupled quantum dots

Abstract: We study the dynamics of single-electron transport in a linear array of tunnelcoupled quantum dots. We show that this system can serve as an ideal quantum channel, enabling a controlled transport and entanglement of electrons in a large-scale integrated quantum computer.

Cited by 114 publications

References 31 publications

Quantum router based on ac control of qubit chains

Quantum router based on ac control of qubit chains

Communication in quantum networks of logical bus topology

Landau–Zener Topological Quantum State Transfer

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