Modelling Conformational Flexibility in a Spectrally Addressable Molecular Multi‐Qubit Model System
Ciarán J. Rogers, Deepak Asthana, Adam Brookfield, Alessandro Chiesa, Grigore A. Timco, David Collison, Louise S. Natrajan, Stefano Carretta, Richard E. P. Winpenny, Alice M. Bowen
Abstract
Abstract Dipolar coupled multi‐spin systems have the potential to be used as molecular qubits. Herein we report the synthesis of a molecular multi‐qubit model system with three individually addressable, weakly interacting, spin centres of differing g ‐values. We use pulsed Electron Paramagnetic Resonance (EPR) techniques to characterise and separately address the individual electron spin qubits; Cu II , Cr 7 Ni ring and a nitroxide, to determine the strength of the inter‐qubit dipolar interaction. Orientation selective Relaxation‐Induced Dipolar Modulation Enhancement (os‐RIDME) detecting across the Cu II spectrum revealed a strongly correlated Cu II ‐Cr 7 Ni ring relationship; detecting on the nitroxide resonance measured both the nitroxide and Cu II or nitroxide and Cr 7 Ni ring correlations, with switchability of the interaction based on differing relaxation dynamics, indicating a handle for implementing EPR‐based quantum information processing (QIP) algorithms.