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Enhancing coherence in molecular spin qubits via atomic clock transitions

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Enhancing coherence in molecular spin qubits via atomic clock transitions

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dc.contributor.author	Shiddiq, Muhandis
dc.contributor.author	Komijani, Dorsa
dc.contributor.author	Duan, Yan
dc.contributor.author	Gaita Ariño, Alejandro
dc.contributor.author	Coronado Miralles, Eugenio
dc.contributor.author	Hill, Stephen
dc.date.accessioned	2021-05-07T06:55:14Z
dc.date.available	2021-05-08T04:45:05Z
dc.date.issued	2016	es_ES
dc.identifier.citation	Shiddiq, M., Komijani, D., Duan, Y. et al. Enhancing coherence in molecular spin qubits via atomic clock transitions. Nature 531, 348–351 (2016).	es_ES
dc.identifier.uri	https://hdl.handle.net/10550/79231
dc.description.abstract	Quantum computing is an emerging area within the information sciences revolving around the concept of quantum bits (qubits). A major obstacle is the extreme fragility of these qubits due to interactions with their environment that destroy their quantumness. This phenomenon, known as decoherence, is of fundamental interest1,2. There are many competing candidates for qubits, including superconducting circuits3, quantum optical cavities4, ultracold atoms5 and spin qubits6,7,8, and each has its strengths and weaknesses. When dealing with spin qubits, the strongest source of decoherence is the magnetic dipolar interaction9. To minimize it, spins are typically diluted in a diamagnetic matrix. For example, this dilution can be taken to the extreme of a single phosphorus atom in silicon6, whereas in molecular matrices a typical ratio is one magnetic molecule per 10,000 matrix molecules10. However, there is a fundamental contradiction between reducing decoherence by dilution and allowing quantum operations via the interaction between spin qubits. To resolve this contradiction, the design and engineering of quantum hardware can benefit from a ‘bottom-up’ approach whereby the electronic structure of magnetic molecules is chemically tailored to give the desired physical behaviour. Here we present a way of enhancing coherence in solid-state molecular spin qubits without resorting to extreme dilution. It is based on the design of molecular structures with crystal field ground states possessing large tunnelling gaps that give rise to optimal operating points, or atomic clock transitions, at which the quantum spin dynamics become protected against dipolar decoherence. This approach is illustrated with a holmium molecular nanomagnet in which long coherence times (up to 8.4 microseconds at 5 kelvin) are obtained at unusually high concentrations. This finding opens new avenues for quantum computing based on molecular spin qubits.	es_ES
dc.description.abstract	Quantum computing is an emerging area within the information sciences revolving around the concept of quantum bits (qubits). A major obstacle is the extreme fragility of these qubits due to interactions with their environment that destroy their quantumness. This phenomenon, known as decoherence, is of fundamental interest1,2. There are many competing candidates for qubits, including superconducting circuits3, quantum optical cavities4, ultracold atoms5 and spin qubits6,7,8, and each has its strengths and weaknesses. When dealing with spin qubits, the strongest source of decoherence is the magnetic dipolar interaction9. To minimize it, spins are typically diluted in a diamagnetic matrix. For example, this dilution can be taken to the extreme of a single phosphorus atom in silicon6, whereas in molecular matrices a typical ratio is one magnetic molecule per 10,000 matrix molecules10. However, there is a fundamental contradiction between reducing decoherence by dilution and allowing quantum operations via the interaction between spin qubits. To resolve this contradiction, the design and engineering of quantum hardware can benefit from a ‘bottom-up’ approach whereby the electronic structure of magnetic molecules is chemically tailored to give the desired physical behaviour. Here we present a way of enhancing coherence in solid-state molecular spin qubits without resorting to extreme dilution. It is based on the design of molecular structures with crystal field ground states possessing large tunnelling gaps that give rise to optimal operating points, or atomic clock transitions, at which the quantum spin dynamics become protected against dipolar decoherence. This approach is illustrated with a holmium molecular nanomagnet in which long coherence times (up to 8.4 microseconds at 5 kelvin) are obtained at unusually high concentrations. This finding opens new avenues for quantum computing based on molecular spin qubits.	en_US
dc.description.sponsorship	FP7-ERC-247384	es_ES
dc.description.sponsorship	ERC-2014-CoG/ 647301	es_ES
dc.description.sponsorship	MAT2014-56143-R	es_ES
dc.description.sponsorship	CTQ2014-52758-P	es_ES
dc.description.sponsorship	MDM-2015-0538	es_ES
dc.language.iso	en	es_ES
dc.title	Enhancing coherence in molecular spin qubits via atomic clock transitions	es_ES
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::QUÍMICA	es_ES
dc.identifier.doi	10.1038/nature16984	es_ES
dc.identifier.idgrec	114072	es_ES
dc.accrualmethod	-	es_ES
dc.embargo.terms	0 days	es_ES