Modelling the effect of charge noise on the exchange interaction between spins

Abstract

We describe how the effect of charge noise on a pair of spins coupled via the exchange interaction can be calculated by modelling charge fluctuations as a random telegraph noise process using probability density functions. We develop analytic expressions for the time dependent superoperator of a pair of spins as a function of fluctuation amplitude and rate. We show that the theory can be extended to include multiple fluctuators, in particular, spectral distributions of fluctuators. These superoperators can be included in time dependent analyses of the state of spin systems designed for spintronics or quantum information processing to determine the decohering effects of exchange fluctuations.

7 pages, 2 figures

References in corpus (6)

• Robust CNOT gates from almost any interaction
• Exchange-controlled single-electron-spin rotations in quantum dots
• Optimal quantum multi-parameter estimation and application to dipole- and exchange-coupled qubits
• A precise CNOT gate in the presence of large fabrication induced variations of the exchange interaction strength
• Equivalent qubit dynamics under classical and quantum noise
• Precision characterisation of two-qubit Hamiltonians via entanglement mapping

Cited by in corpus (5)

• Disentanglement and decoherence from classical non-Markovian noise: Random telegraph noise
• Suppression of Decoherence and Disentanglement by the Exchange Interaction
• Topology of Entanglement Evolution of Two Qubits
• Controlled-NOT gate sequences for mixed spin qubit architectures in a noisy environment
• Disappearance of entanglement: a topological point of view