Vibrational exciton-mediated quantum state transfert: a simple model
arXiv:1201.5184 · doi:10.1103/PhysRevB.85.214303
Abstract
A communication protocol is proposed in which quantum state transfer is mediated by a vibrational exciton. We consider two distant molecular groups grafted on the sides of a lattice. These groups behave as two quantum computers where the information in encoded and received. The lattice plays the role of a communication channel along which the exciton propagates and interacts with a phonon bath. Special attention is paid for describing the system involving an exciton dressed by a single phonon mode. The Hamiltonian is thus solved exactly so that the relevance of the perturbation theory is checked. Within the nonadiabatic weak-coupling limit, it is shown that the system supports three quasi-degenerate states that define the relevant paths followed by the exciton to tunnel between the computers. When the model parameters are judiciously chosen, constructive interferences take place between these paths. Phonon-induced decoherence is minimized and a high-fidelity quantum state transfer occurs over a broad temperature range.
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References in corpus (15)
- Quantum computing with trapped ions
- Perfect Transfer of Arbitrary States in Quantum Spin Networks
- Robust Quantum State Transfer in Random Unpolarized Spin Chains
- Spin Chains as Perfect Quantum State Mirrors
- Quantum state transmission via a spin ladder as a robust data bus
- Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains
- Non-Perturbative Entangling Gates between Distant Qubits using Uniform Cold Atom Chains
- Optimal dynamics for quantum-state and entanglement transfer through homogeneous quantum wires
- Alternative fidelity measure for quantum states
- Long quantum channels for high-quality entanglement transfer
- Optimal quantum chain communication by end gates
- Coherent state transfer via highly mixed quantum spin chains
- Quantum state transfer and time-dependent disorder in Quantum Chains
- State transfer in intrinsic decoherence spin channels
- Peierls distorted chain as a quantum data bus for quantum state transfer