Engineering robust and scalable molecular qubits PhysRevX
Quantum bits are the building blocks for quantum information science, an emerging field that seeks to use quantum-mechanical properties to advance areas from secure communication to biological sensing. The spins of electrons are attractive qubits, as they can preserve quantum states over long timescales and be controlled with light. Housing such optically active spins in molecules offers opportunities to chemically design qubits for bespoke applications.
The environment around a qubit creates noise—from the fluctuating magnetic fields of atomic nuclei, for example—which limits the qubit’s coherence. One approach to mitigate this decoherence is to reduce the noise sources. However, this strategy is not always possible or convenient. We use an alternative approach: We create optically addressable molecular qubits that are intrinsically less sensitive to noise by chemically controlling their molecular packing.
Such noise-protected molecular qubits, which can be remotely controlled with light, hold promise for applications in nanoscale sensing in intrinsically noisy environments such as biological cells. Here, the versatility enabled by chemically synthesized qubits appears particularly exciting for future advancements.
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