Long range magnetic dipole-dipole interaction mediated by a superconductor

Abstract

Quantum computation and simulation requires strong coherent coupling between qubits, which may be spatially separated. Achieving this coupling for solid-state based spin qubits is a long-standing challenge. Here we theoretically investigate a method for achieving such coupling, based on superconducting nano-structures designed to channel the magnetic flux created by the qubits. We detail semi-classical analytical calculations and simulations of the magnetic field created by a magnetic dipole, depicting the spin qubit, positioned directly below nanofabricated apertures in a superconducting layer. We show that such structures could channel the magnetic flux, enhancing the dipole-dipole interaction between spin qubits and changing its scaling with distance, thus potentially paving the way for controllably engineering an interacting spin system.

References in corpus (17)

• Heralded entanglement between solid-state qubits separated by 3 meters
• A Two Qubit Logic Gate in Silicon
• Solid-state electronic spin coherence time approaching one second
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Room temperature entanglement between distant single spins in diamond
• Scalable quantum register based on coupled electron spins in a room temperature solid
• Semiconductor Qubits In Practice
• Long-Range Interaction of Spin-Qubits via Ferromagnets
• Long-distance spin-spin coupling via floating gates
• Thin superconductors and SQUIDs in perpendicular magnetic field
• Casimir-Polder interaction between a polarizable particle and a plate with a hole
• Force on a neutral atom near conducting microstructures
• Long-distance entangling gates between quantum dot spins mediated by a superconducting resonator
• Analytic solutions to the Maxwell-London equations and levitation force for a superconducting sphere in a quadrupole field
• Arbitrary Control of Entanglement between two nitrogen-vacancy center ensembles coupling to superconducting circuit qubit
• A theoretical model for parallel SQUID arrays with fluxoid focussing
• Screening magnetic fields by a superconducting disk: a simple model