A modular design of molecular qubits to implement universal quantum gates

Jesús Ferrando-Soria, Eufemio Moreno Pineda, Alessandro Chiesa, Antonio Fernandez, Samantha A. Magee, Stefano Carretta, Paolo Santini, Iñigo J. Vitorica-Yrezabal, Floriana Tuna, Grigore A. Timco, Eric J.L. McInnes and Richard E.P. Winpenny ()
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Jesús Ferrando-Soria: School of Chemistry and Photon Science Institute, The University of Manchester
Eufemio Moreno Pineda: School of Chemistry and Photon Science Institute, The University of Manchester
Alessandro Chiesa: Università di Parma
Antonio Fernandez: School of Chemistry and Photon Science Institute, The University of Manchester
Samantha A. Magee: School of Chemistry and Photon Science Institute, The University of Manchester
Stefano Carretta: Università di Parma
Paolo Santini: Università di Parma
Iñigo J. Vitorica-Yrezabal: School of Chemistry and Photon Science Institute, The University of Manchester
Floriana Tuna: School of Chemistry and Photon Science Institute, The University of Manchester
Grigore A. Timco: School of Chemistry and Photon Science Institute, The University of Manchester
Eric J.L. McInnes: School of Chemistry and Photon Science Institute, The University of Manchester
Richard E.P. Winpenny: School of Chemistry and Photon Science Institute, The University of Manchester

Nature Communications, 2016, vol. 7, issue 1, 1-10

Abstract: Abstract The physical implementation of quantum information processing relies on individual modules—qubits—and operations that modify such modules either individually or in groups—quantum gates. Two examples of gates that entangle pairs of qubits are the controlled NOT-gate (CNOT) gate, which flips the state of one qubit depending on the state of another, and the gate that brings a two-qubit product state into a superposition involving partially swapping the qubit states. Here we show that through supramolecular chemistry a single simple module, molecular {Cr7Ni} rings, which act as the qubits, can be assembled into structures suitable for either the CNOT or gate by choice of linker, and we characterize these structures by electron spin resonance spectroscopy. We introduce two schemes for implementing such gates with these supramolecular assemblies and perform detailed simulations, based on the measured parameters including decoherence, to demonstrate how the gates would operate.

Date: 2016
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DOI: 10.1038/ncomms11377

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