A scalable architecture for quantum computation with molecular nanomagnets

Abstract

A proposal for a magnetic quantum processor that consists of individual molecular spins coupled to superconducting coplanar resonators and transmission lines is carefully examined. We derive a simple magnetic quantum electrodynamics Hamiltonian to describe the underlying physics. It is shown that these hybrid devices can perform arbitrary operations on each spin qubit and induce tunable interactions between any pair of them. The combination of these two operations ensures that the processor can perform universal quantum computations. The feasibility of this proposal is critically discussed using the results of realistic calculations, based on parameters of existing devices and molecular qubits. These results show that the proposal is feasible, provided that molecules with sufficiently long coherence times can be developed and accurately integrated into specific areas of the device. This architecture has an enormous potential for scaling up quantum computation thanks to the microscopic nature of the individual constituents, the molecules, and the possibility of using their internal spin degrees of freedom.

27 pages, 6 figures

References in corpus (17)

• Quantum Computing
• Coupling Superconducting Qubits via a Cavity Bus
• Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Supramolecular Spin Valves
• Strong Coupling of a Spin Ensemble to a Superconducting Resonator
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
• Coplanar Waveguide Resonators for Circuit Quantum Electrodynamics
• Quantum computing with an electron spin ensemble
• Reducing intrinsic loss in superconducting resonators by surface treatment and deep etching of silicon substrates
• Decoherence in Crystals of Quantum Molecular Magnets
• Direct Observation of Quantum Coherence in Single-Molecule Magnets
• Pair-wise decoherence in coupled spin qubit networks
• YBCO microwave resonators for strong collective coupling with spin ensembles
• Minimal qudit code for a qubit in the phase-damping channel

Cited by in corpus (6)

• Three addressable spin qubits in a molecular single-ion magnet
• Enhanced molecular spin-photon coupling at superconducting nanoconstrictions
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II)
• Perfect state transfer on hypercubes and its implementation using superconducting qubits
• High cooperativity coupling to nuclear spins on a circuit QED architecture
• A switching approach for perfect state transfer over a scalable and routing enabled network architecture with superconducting qubits