Pair-wise decoherence in coupled spin qubit networks

Abstract

Experiments involving phase coherent dynamics of networks of spins, such as echo experiments, will only work if decoherence can be suppressed. We show here, by analyzing the particular example of a crystalline network of Fe8 molecules, that most decoherence typically comes from pairwise interactions (particularly dipolar interactions) between the spins, which cause `correlated errors'. However at very low T these are strongly suppressed. These results have important implications for the design of quantum information processing systems using electronic spins.

4 pages, 4 figures. Final PRL version

References in corpus (5)

• Single-shot read-out of an individual electron spin in a quantum dot
• Bang-bang control of fullerene qubits using ultra-fast phase gates
• Fault-Tolerant Quantum Computation For Local Non-Markovian Noise
• S-mixing and quantum tunneling of the magnetization in molecular nanomagnets
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Cited by in corpus (12)

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• Direct Observation of Quantum Coherence in Single-Molecule Magnets
• Coherent Manipulation and Decoherence of S=10 Single-Molecule Magnets
• Controllability of open quantum systems with Kraus-map dynamics
• Local Magnetic Properties of a Monolayer of Mn12 Single Molecule Magnets
• Pump-Probe Experiments on the Single-Molecule Magnet Fe8 : Measurement of Excited Level Lifetimes
• Experimental Estimates of Dephasing Time in Molecular Magnets
• Dynamics and thermalization of the nuclear spin bath in the single-molecule magnet Mn12-ac: test for the theory of spin tunneling
• Decoherence in quantum walks and quantum computers
• Persistent Spin Dynamics in the $S=1/2$ V${}_{15}$ Molecular Nano-Magnet
• Dynamics of periodic anticrossings: Decoherence, pointer states and hysteresis curves
• Energy Level Lifetimes in the Single-Molecule Magnet Fe_8 : Experiments and Simulations