Ultrafast entangling gates between nuclear spins using photo-excited triplet states

Abstract

The representation of information within the spins of electrons and nuclei has been powerful in the ongoing development of quantum computers. Although nuclear spins are advantageous as quantum bits (qubits) due to their long coherence lifetimes (exceeding seconds), they exhibit very slow spin interactions and have weak polarisation. A coupled electron spin can be used to polarise the nuclear spin and create fast single-qubit gates, however, the permanent presence of electron spins is a source of nuclear decoherence. Here we show how a transient electron spin, arising from the optically excited triplet state of C60, can be used to hyperpolarise, manipulate and measure two nearby nuclear spins. Implementing a scheme which uses the spinor nature of the electron, we performed an entangling gate in hundreds of nanoseconds: five orders of magnitude faster than the liquid-state J coupling. This approach can be widely applied to systems comprising an electron spin coupled to multiple nuclear spins, such as NV centres, while the successful use of a transient electron spin motivates the design of new molecules able to exploit photo-excited triplet states.

5 pages, 3 figures

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• Quantum phase interference in a fullerene-based molecular qutrit
• Optical readout of singlet fission biexcitons with photoluminescence detected magnetic resonance
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• Randomized benchmarking of quantum gates implemented by electron spin resonance
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• Chemically Tuning Room Temperature Pulsed Optically Detected Magnetic Resonance
• Exchange interaction between the triplet exciton and the localized spin in copper-phthalocyanine
• Excited states of defect lines in silicon: A first-principles study based on hydrogen cluster analogues
• Quantum computation with noisy operations
• Spin polarized induction of quantum correlations-entanglement using a 2 MeV proton beam channeling