Perfect state transfer in long-range interacting spin chains
arXiv:0807.5018 · doi:10.1103/PhysRevA.78.022325
Abstract
We investigate the most general conditions under which a finite ferromagnetic long-range inter- acting spin chain achieves unitary fidelity and the shortest transfer time in transmitting an unknown input qubit. A deeper insight into system dynamics, allows us to identify an ideal system involving sender and receiver only. However, this two-spin ideal chain is unpractical due to the rapid decrease of the coupling strength with the distance. Therefore, we propose an optimization scheme for ap- proaching the ideal behaviour, while keeping the interaction strength still reasonably high. The procedure is scalable with the size of the system and straightforward to implement.
5 pages, 5 figures
References in corpus (6)
- Mirror Inversion of Quantum States in Linear Registers
- Spin Chains as Perfect Quantum State Mirrors
- Perfect State Transfer: Beyond Nearest-Neighbor Couplings
- Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains
- Improved transfer of quantum information using a local memory
- Quantum Communication in Spin Systems With Long-Range Interactions