Optimized quantum state transfer through an XY spin chain

Abstract

Quantum state transfer along a one-dimensional spin chain has become a fundamental ingredient for quantum communication between distant nodes in a quantum network. We study the average fidelity of quantum state transfer (QST) along a XY spin chain by adjusting the basis identification between the first spin and the last spin. In a proper choice of the basis identification, we find that the QST fidelity depends only on the average parity of the initial state linearly. We propose a simple scheme to adjusting the basis identification to optimize the average fidelity such that it depends linearly on the absolute value of the average parity. In the case that the absolute value of the average parity is $1$ we prove that the fidelity takes the maximum at any time over arbitrary initial state and basis identification.

6 pages, 4 figures

References in corpus (8)

• Perfect state transfer on a spin-chain without state initialization
• Long-distance entanglement and quantum teleportation in XX spin chains
• Quantum state transmission via a spin ladder as a robust data bus
• Electron wavepacket propagation and entanglement in a chain of coupled quantum dots
• Perfect state transfer in long-range interacting spin chains
• 99%-fidelity ballistic quantum-state transfer through long uniform channels
• Initializing an unmodulated spin chain to operate as a high quality quantum data-bus
• Information-flux approach to multiple-spin dynamics

Cited by in corpus (6)

• Protected quantum-state transfer in decoherence-free subspaces
• Turnplate of quantum state
• Transfer arbitrary photon state along a cavity array without initialization
• Enhancing quantum state transfer efficiency in binary-tree spin networks by partially collapsing measurements
• Multiphoton controllable transport between remote resonators
• Entanglement Transfer and C-Not Gate Implemented in A Fiber Connected 3-Atom System