Adiabatic information transport in the presence of decoherence

Kamleitner, I.; Cresser, J. D.; Twamley, J.

doi:10.1103/physreva.77.032331

Cited by 19 publications

(24 citation statements)

References 22 publications

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“…In order to discuss the transfer of double excitation states, we make use of the wave function (8). Since for the transfer mediated by the atoms, the best result is expected to occur when the atomic transition frequencies are in resonance with the cavity field frequencies, we set ∆ = 0 in what follows in this section.…”

Section: A Transfer Mediated By Atomsmentioning

confidence: 99%

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Atoms versus photons as carriers of quantum states

Bougouffa

Ficek

2013

Phys. Rev. A

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The problem of the complete transfer of quantum states and entanglement in a four-qubit system composed of two single-mode cavities and two two-level atoms is investigated. The transfer of single and double excitation states is discussed for two different coupling configurations between the qubits. In the first, the coupling is mediated by the atoms that simultaneously couple to the cavity modes. In the second configuration, each atom resides inside one of the cavities and the coupling between the cavities is mediated by the overlapping field modes. A proper choice of basis states makes it possible to identify states that could be completely transferred between themselves. Simple expressions are derived for the conditions for the complete transfer of quantum states and entanglement. These conditions impose severe constraints on the evolution of the system in the form of constants of motion. The constrains on the evolution of the system imply that not all states can evolve in time, and we find that the evolution of the entire system can be confined into that occurring among two states only. Detailed analysis show that in the case where the interaction is mediated by the atoms, only symmetric superposition states can be completely and reversibly transferred between the atoms and the cavity modes. In the case where the interaction is mediated by the overlapping field modes, both symmetric and antisymmetric superposition states can be completely transferred. We also show that the system is capable of generating purely photonic NOON states, but only if the coupling is mediated by the atoms, and demonstrate that the ability to generate the NOON states relies on perfect transfer of an entanglement from the atoms to the cavity modes.

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Section: A Transfer Mediated By Atomsmentioning

confidence: 99%

“…In most schemes, linear atomic chains or atomic (spin) lattices are considered for the transfer of quantum states [8][9][10]. In these models the transfer is mediated by the direct dipole-dipole coupling between neighbouring atoms, which induces the flow of an initial excitation through the chain [11].…”

Section: Introductionmentioning

confidence: 99%

Atoms versus photons as carriers of quantum states

Bougouffa

Ficek

2013

Phys. Rev. A

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“…Thus, such measurement would influence the effect that it should substantiate. For example, coupling the middle dot to a charge detector [6,7] impacts significantly on the dot populations [8], since it causes decoherence to which CTAP is quite sensitive [9]. Consequently, as a matter of principle, direct observation of the dot populations is of limited use and, thus, one may have to resort to an indirect verification.In this work, we propose a generalization of CTAP that circumvents this difficulty and predicts an experimental fingerprint for the non-occupation of the middle dot.…”

mentioning

confidence: 99%

Steady-State Coherent Transfer by Adiabatic Passage

2013

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We propose steady-state electron transport based on coherent transfer by adiabatic passage (CTAP) in a linearly arranged triple quantum dot with leads attached to the outer dots. Its main feature is repeated steering of single electrons from the first dot to the last dot without relevant occupation of the middle dot. The coupling to leads enables a steady-state current, whose shot noise is significantly suppressed provided that the CTAP protocol performs properly. This represents an indication for the direct transfer between spatially separated dots and, thus, may resolve the problem of finding experimental evidence for the nonoccupation of the middle dot.

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“…Increasing the transfer distance, we found that the effi- ciency of QST is inversely proportional to the distance of the two QDs. In a real system, decoherence is the main obstacle to the experimental implementation of quantum information [23,24]. There are two sources of quantum decoherence in QDs, one is due to charge dephasing brought by lead-QD coupling and the other is due to the hyperfine interaction.…”

Section: Summary and Discussionmentioning

confidence: 99%

Long-range adiabatic quantum state transfer through a tight-binding chain as a quantum data bus

Chen

Fan

et al. 2012

Phys. Rev. A

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We introduce a scheme based on adiabatic passage which allows for long-range quantum communication through tight-binding chain with always-on interaction. By adiabatically varying the external gate voltage applied on the system, the electron can be transported from the sender's dot to the aim one. We numerically solve the schrödinger equation for a system with given number of quantum dots. It is shown that this scheme is a simple and efficient protocol to coherently manipulate the population transfer under suitable gate pulses. The dependence of the energy gap and the transfer time on system parameters is analyzed and shown numerically. Our method provides a guidance for future realization of adiabatic quantum state transfer in experiments.

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Adiabatic information transport in the presence of decoherence

Cited by 19 publications

References 22 publications

Atoms versus photons as carriers of quantum states

Atoms versus photons as carriers of quantum states

Steady-State Coherent Transfer by Adiabatic Passage

Long-range adiabatic quantum state transfer through a tight-binding chain as a quantum data bus

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