Molecular One‐ and Two‐Qubit Systems with Very Long Coherence Times

General‐purpose quantum computation and quantum simulation require multi‐qubit architectures with precisely defined, robust interqubit interactions, coupled with local addressability. This is an unsolved challenge, primarily due to scalability issues. These issues often derive from poor control over...

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Published in:Advanced materials (Weinheim) Vol. 35; no. 38; p. e2302114
Main Authors: Schäfter, Dennis, Wischnat, Jonathan, Tesi, Lorenzo, De Sousa, J. Alejandro, Little, Edmund, McGuire, Jake, Mas‐Torrent, Marta, Rovira, Concepció, Veciana, Jaume, Tuna, Floriana, Crivillers, Núria, van Slageren, Joris
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 01.09.2023
Subjects:
Materials science
Quantum computing
Qubits (quantum computing)
Radicals
Spin dynamics
quantum technologies
quantum coherence
electron paramagnetic resonance
organic radicals
molecular quantum bits
ISSN:0935-9648, 1521-4095, 1521-4095
Online Access:Get full text
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Summary:General‐purpose quantum computation and quantum simulation require multi‐qubit architectures with precisely defined, robust interqubit interactions, coupled with local addressability. This is an unsolved challenge, primarily due to scalability issues. These issues often derive from poor control over interqubit interactions. Molecular systems are promising materials for the realization of large‐scale quantum architectures, due to their high degree of positionability and the possibility to precisely tailor interqubit interactions. The simplest quantum architecture is the two‐qubit system, with which quantum gate operations can be implemented. To be viable, a two‐qubit system must possess long coherence times, the interqubit interaction must be well defined and the two qubits must also be addressable individually within the same quantum manipulation sequence. Here results are presented on the investigation of the spin dynamics of chlorinated triphenylmethyl organic radicals, in particular the perchlorotriphenylmethyl (PTM) radical, a mono‐functionalized PTM, and a biradical PTM dimer. Extraordinarily long ensemble coherence times up to 148 µs are found at all temperatures below 100 K. Two‐qubit and, importantly, individual qubit addressability in the biradical system are demonstrated. These results underline the potential of molecular materials for the development of quantum architectures.
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ISSN:0935-9648
1521-4095
1521-4095
DOI:10.1002/adma.202302114