Quantum Data Bus in Dipolar Coupled Nuclear Spin Qubits

Abstract

We implement an iterative quantum state transfer exploiting the natural dipolar couplings in a spin chain of a liquid crystal NMR system. During each iteration a finite part of the amplitude of the state is transferred and by applying an external operation on only the last two spins the transferred state is made to accumulate on the spin at the end point. The transfer fidelity reaches one asymptotically through increasing the number of iterations. We also implement the inverted version of the scheme which can transfer an arbitrary state from the end point to any other position of the chain and entangle any pair of spins in the chain, acting as a full quantum data bus.

published in PRA

References in corpus (18)

• Quantum Communication Through an Unmodulated Spin Chain
• Perfect state transfer in quantum spin networks
• Quantum Communication through Spin Chain Dynamics: an Introductory Overview
• Perfect state transfer on a spin-chain without state initialization
• Liquid State NMR as a Test-bed for Developing Quantum Control Methods
• Globally controlled quantum wires for perfect qubit transport, mirroring and computing
• Coupling strength estimation for spin chains despite restricted access
• Simulations of Information Transport in Spin Chains
• Direct observation of quantum criticality in Ising spin chains
• Optimal quantum chain communication by end gates
• Dynamics and Control of a Quasi-1D Spin System
• Quantum state transfer and time-dependent disorder in Quantum Chains
• Quantum information processing using strongly-dipolar coupled nuclear spins
• Quantum Information Processing with Delocalized Qubits under Global Control
• Iterative quantum state transfer along a chain of nuclear spin qubits
• Preparation of pseudopure state in a cluster of dipolar-coupled spins with "unresolved" spectrum
• High-probability quantum state transfer among nodes of an open XXZ spin chain
• Fidelity enhancement by logical qubit encoding

Cited by in corpus (12)

• Robust Quantum State Transfer in Random Unpolarized Spin Chains
• NMR multiple quantum coherences in quasi-one-dimensional spin systems: Comparison with ideal spin-chain dynamics
• Quantum Logic between Remote Quantum Registers
• Transport of Quantum Correlations across a spin chain
• Universal Existence of Exact Quantum State Transmissions in Interacting Media
• Simulation of mirror inversion of quantum states in an XY spin chain using NMR
• Controlled quantum state transfer in $XX$ spin chains at the Quantum Speed Limit
• Statistics of a quantum-state-transfer Hamiltonian in the presence of disorder
• Robustness of spin-chain state-transfer schemes
• Understanding the propagation of excitations in quantum spin chains with different kind of interactions
• Noise effects in perfect transmission of quantum states
• Exact solution of a family of staggered Heisenberg chains with conclusive pretty good quantum state transfer