Molecular engineering of antiferromagnetic rings for quantum computation

Abstract

The substitution of one metal ion in a Cr-based molecular ring with dominant antiferromagnetic couplings allows to engineer its level structure and ground-state degeneracy. Here we characterize a Cr7Ni molecular ring by means of low-temperature specific-heat and torque-magnetometry measurements, thus determining the microscopic parameters of the corresponding spin Hamiltonian. The energy spectrum and the suppression of the leakage-inducing S-mixing render the Cr7Ni molecule a suitable candidate for the qubit implementation, as further substantiated by our quantum-gate simulations.

To appear in Physical Review Letters

References in corpus (12)

• Quantum Computing in Molecular Magnets
• Quantum Coherence in an Exchange-Coupled Dimer of Single-Molecule Magnets
• Quantum computing with spin cluster qubits
• Quantum Computing with an 'Always On' Heisenberg Interaction
• Quantum computing with antiferromagnetic spin clusters
• Rotational modes in molecular magnets with antiferromagnetic Heisenberg exchange
• Quantum-gate implementation in permanently coupled AF spin rings without need of local fields
• Efficient Refocussing of One Spin and Two Spin Interactions for NMR Quantum Computation
• Spin dynamics of heterometallic Cr7M wheels (M = Mn, Zn, Ni) probed by inelastic neutron scattering
• Elementary excitations in the cyclic molecular nanomagnet Cr8
• Quantum computation with un-tunable couplings
• Exponentially Localized Magnetic Fields for Single-Spin Quantum Logic Gates

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