Amazing stuff!
"Scientists are turning to supramolecular chemistry to design new, more efficient and flexible molecular qubits for quantum technologies, like quantum computing. ...
While many quantum computers use superconductors, trapped ions or photons to create qubits, molecular qubits offer an interesting alternative. By exploiting molecular properties, like electronic and nuclear spin states, these systems can store and manipulate quantum information. Advantages include tunability through molecular design and longer coherence times, which allows qubits to maintain their quantum state – and the information they hold – for longer. ...
Molecular qubits, or qudits, are unique because they can hold multiple qubits within a single molecule, creating a larger space for storing and processing information, compared with conventional qubits.
‘Quantum error correction operations, which are the bottleneck of current quantum computers and the reason why their impact on the market is still quite limited, are much more efficient in qudits,’ ...
The resulting triplet–doublet system interacts through the hydrogen bond molecular bridge, through which the system’s spins become entangled and ‘mix’ – referred to as spin mixing – to yield a ‘quartet state’ with four possible configurations that can be individually controlled using microwave radiation. ...
The chromophore–radical systems were self-assembled using supramolecular chemistry, a process that relies on non-covalent interactions to bring molecules together. This approach not only allows precise control over the structure and properties of the system but has the added advantage of scalability to create larger, more complex systems. ..."
From the abstract:
"Molecular spin qubits have the advantages of synthetic flexibility and amenability to be tailored to specific applications.
Among them, chromophore–radical systems have emerged as appealing qubit candidates. These systems can be initiated by light to form triplet–radical pairs that can result in the formation of quartet states by spin mixing.
For a triplet–radical pair to undergo spin mixing, the molecular bridge joining the spin centres must permit effective spin communication, which has previously been ensured using covalent, π-conjugated linkers.
Here we used perylenediimides and nitroxide radicals designed to self-assemble in solution via hydrogen bonding and observed, using electron paramagnetic resonance spectroscopy, the formation of quartet states that can be manipulated coherently using microwaves.
This unprecedented finding that non-covalent bonds can enable spin mixing advances supramolecular chemistry as a valuable tool for exploring, developing and scaling up materials for quantum information science."
Supramolecular dyads as photogenerated qubit candidates (no public access)
The new supramolecular qubits make use of hydrogen bonding to control the interaction between quantum spins
On photoexcitation of a chromophore–radical pair
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