Robust quantum entanglement generation and generation-plus-storage protocols with spin chains

TY - JOUR

T1 - Robust quantum entanglement generation and generation-plus-storage protocols with spin chains

AU - Estarellas, Marta P.

AU - D'Amico, Irene

AU - Spiller, Timothy P.

N1 - ©2017 American Physical Society

PY - 2017/4/24

Y1 - 2017/4/24

N2 - Reliable quantum communication and/or processing links between modules are a necessary building block for various quantum processing architectures. Here we consider a spin-chain system with alternating strength couplings and containing three defects, which impose three domain walls between topologically distinct regions of the chain. We show that - in addition to its useful, high-fidelity, quantum state transfer properties - an entangling protocol can be implemented in this system, with optional localization and storage of the entangled states. We demonstrate both numerically and analytically that, given a suitable initial product-state injection, the natural dynamics of the system produces a maximally entangled state at a given time. We present detailed investigations of the effects of fabrication errors, analyzing random static disorder both in the diagonal and off-diagonal terms of the system Hamiltonian. Our results show that the entangled state formation is very robust against perturbations of up to ∼10% the weaker chain coupling, and also robust against timing injection errors. We propose a further protocol, which manipulates the chain in order to localize and store each of the entangled qubits. The engineering of a system with such characteristics would thus provide a useful device for quantum information processing tasks involving the creation and storage of entangled resources.

AB - Reliable quantum communication and/or processing links between modules are a necessary building block for various quantum processing architectures. Here we consider a spin-chain system with alternating strength couplings and containing three defects, which impose three domain walls between topologically distinct regions of the chain. We show that - in addition to its useful, high-fidelity, quantum state transfer properties - an entangling protocol can be implemented in this system, with optional localization and storage of the entangled states. We demonstrate both numerically and analytically that, given a suitable initial product-state injection, the natural dynamics of the system produces a maximally entangled state at a given time. We present detailed investigations of the effects of fabrication errors, analyzing random static disorder both in the diagonal and off-diagonal terms of the system Hamiltonian. Our results show that the entangled state formation is very robust against perturbations of up to ∼10% the weaker chain coupling, and also robust against timing injection errors. We propose a further protocol, which manipulates the chain in order to localize and store each of the entangled qubits. The engineering of a system with such characteristics would thus provide a useful device for quantum information processing tasks involving the creation and storage of entangled resources.

UR - http://www.scopus.com/inward/record.url?scp=85018581311&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.95.042335

DO - 10.1103/PhysRevA.95.042335

M3 - Article

AN - SCOPUS:85018581311

SN - 1050-2947

VL - 95

JO - Physical Review A

JF - Physical Review A

IS - 4

M1 - 042335

ER -