Controllable anisotropic exchange coupling between spin qubits in quantum dots

Abstract

The exchange coupling between quantum dot spin qubits is isotropic, which restricts the types of quantum gates that can be formed. Here, we propose a method for controlling anisotropic interactions between spins arranged in a bus geometry. The symmetry is broken by an external magnetic field, resulting in XXZ-type interactions that can efficiently generate Greenberger-Horne-Zeilinger (GHZ) states or universal gate sets for exchange-only quantum computing. Analysis of the bus ground state provides a link between quantum critical phenomena and the communication capacity.

4 pages with 3 figures

References in corpus (5)

• Electrically driven single electron spin resonance in a slanting Zeeman field
• Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains
• Efficient multiqubit entanglement via a spin-bus
• Maximally entangling tripartite protocols for Josephson phase qubits
• Even-Odd Effects of Heisenberg Chains on Long-range Interaction and Entanglement

Cited by in corpus (8)

• Heisenberg Spin Bus as a Robust Transmission Line for Perfect State Transfer
• Factorization and criticality in finite XXZ systems of arbitrary spin
• Zero field splitting of heavy-hole states in quantum dots
• Mediated gates between spin qubits
• Effect of Randomness on Quantum Data Buses of Heisenberg Spin Chains
• Probing Quantum Phase Transitions on a Spin Chain with a Double Quantum Dot
• Cloaking the magnons
• Inducing critical phenomena in spin chains through sparse alternating fields