Robust state transfer with high fidelity in spin-1/2 chains by Lyapunov control

Abstract

Based on the Lyapunov control, we present a scheme to realize state transfer with high fidelity by only modulating the boundary spins in a quantum spin-1/2 chain. Recall that the conventional transmission protocols aim at nonstationary state (or information) transfer from the first spin to the end spin at a fixed time. The present scheme possesses the following advantages. First, the scheme does not require precise manipulations of the control time. Second, it is robust against uncertainties in the initial states and fluctuations in the control fields. Third, the controls are exerted only on the boundary sites of the chain. It works for variable spin-1/2 chains with different periodic structures and has good scalability. The feasibility to replace the control fields by square pules is explored, which simplifies the realization in experiments.

References in corpus (8)

• Quantum Communication through Spin Chain Dynamics: an Introductory Overview
• Long-distance entanglement and quantum teleportation in XX spin chains
• Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains
• Perfect state transfer in long-range interacting spin chains
• Entanglement generation between distant atoms by Lyapunov control
• Practicality of spin chain 'wiring' in diamond quantum technologies
• Mesoscopic continuous and discrete channels for quantum information transfer
• High-probability quantum state transfer among nodes of an open XXZ spin chain

Cited by in corpus (3)

• Almost perfect transmission of multipartite entanglement through disordered and noisy spin chains
• Robust and efficient transport of two-qubit entanglement via disordered spin chains
• Entangled states of two quantum dots mediated by Majorana fermions