Room‐Temperature Quantum Memories Based on Molecular Electron Spin Ensembles

Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential devices in the quantum technology palette and are needed for intermediate storage of quantum bit states and as quantum repeaters in long‐dist...

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Veröffentlicht in:	Advanced materials (Weinheim) Jg. 33; H. 30; S. e2101673 - n/a
Hauptverfasser:	Lenz, Samuel, König, Dennis, Hunger, David, Slageren, Joris
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Germany Wiley Subscription Services, Inc 01.07.2021 John Wiley and Sons Inc
Schlagworte:	Coupling (molecular) Cryogenic temperature Electron spin Materials science microwave pulse storage molecular quantum bits organic radicals Quantum computing quantum memories quantum technologies Qubits (quantum computing) Repeaters Room temperature quantum technologies quantum memories organic radicals molecular quantum bits microwave pulse storage
ISSN:	0935-9648, 1521-4095, 1521-4095
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Abstract	Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential devices in the quantum technology palette and are needed for intermediate storage of quantum bit states and as quantum repeaters in long‐distance quantum communication. Current quantum memories operate at cryogenic, mostly sub‐Kelvin temperatures and require extensive and costly peripheral hardware. It is demonstrated that ensembles of weakly coupled molecular spins show long coherence times and can be used to store microwave pulses of arbitrary phase. These studies exploit strong coupling of the spin ensemble to special 3D microwave resonators. Most importantly, these systems operate at room temperature. Ensembles of weakly exchange coupled organic radicals form strongly coupled systems with 3D microwave resonators. Time‐domain pulsed microwave investigations reveal long, largely temperature‐independent quantum coherence times. The room‐temperature storage and retrieval of microwave pulses is demonstrated.
AbstractList	Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential devices in the quantum technology palette and are needed for intermediate storage of quantum bit states and as quantum repeaters in long‐distance quantum communication. Current quantum memories operate at cryogenic, mostly sub‐Kelvin temperatures and require extensive and costly peripheral hardware. It is demonstrated that ensembles of weakly coupled molecular spins show long coherence times and can be used to store microwave pulses of arbitrary phase. These studies exploit strong coupling of the spin ensemble to special 3D microwave resonators. Most importantly, these systems operate at room temperature. Ensembles of weakly exchange coupled organic radicals form strongly coupled systems with 3D microwave resonators. Time‐domain pulsed microwave investigations reveal long, largely temperature‐independent quantum coherence times. The room‐temperature storage and retrieval of microwave pulses is demonstrated. Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential devices in the quantum technology palette and are needed for intermediate storage of quantum bit states and as quantum repeaters in long-distance quantum communication. Current quantum memories operate at cryogenic, mostly sub-Kelvin temperatures and require extensive and costly peripheral hardware. It is demonstrated that ensembles of weakly coupled molecular spins show long coherence times and can be used to store microwave pulses of arbitrary phase. These studies exploit strong coupling of the spin ensemble to special 3D microwave resonators. Most importantly, these systems operate at room temperature. Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential devices in the quantum technology palette and are needed for intermediate storage of quantum bit states and as quantum repeaters in long‐distance quantum communication. Current quantum memories operate at cryogenic, mostly sub‐Kelvin temperatures and require extensive and costly peripheral hardware. It is demonstrated that ensembles of weakly coupled molecular spins show long coherence times and can be used to store microwave pulses of arbitrary phase. These studies exploit strong coupling of the spin ensemble to special 3D microwave resonators. Most importantly, these systems operate at room temperature. Ensembles of weakly exchange coupled organic radicals form strongly coupled systems with 3D microwave resonators. Time‐domain pulsed microwave investigations reveal long, largely temperature‐independent quantum coherence times. The room‐temperature storage and retrieval of microwave pulses is demonstrated. Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential devices in the quantum technology palette and are needed for intermediate storage of quantum bit states and as quantum repeaters in long-distance quantum communication. Current quantum memories operate at cryogenic, mostly sub-Kelvin temperatures and require extensive and costly peripheral hardware. It is demonstrated that ensembles of weakly coupled molecular spins show long coherence times and can be used to store microwave pulses of arbitrary phase. These studies exploit strong coupling of the spin ensemble to special 3D microwave resonators. Most importantly, these systems operate at room temperature.Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential devices in the quantum technology palette and are needed for intermediate storage of quantum bit states and as quantum repeaters in long-distance quantum communication. Current quantum memories operate at cryogenic, mostly sub-Kelvin temperatures and require extensive and costly peripheral hardware. It is demonstrated that ensembles of weakly coupled molecular spins show long coherence times and can be used to store microwave pulses of arbitrary phase. These studies exploit strong coupling of the spin ensemble to special 3D microwave resonators. Most importantly, these systems operate at room temperature.
Author	Slageren, Joris Lenz, Samuel König, Dennis Hunger, David
AuthorAffiliation	1 Institute of Physical Chemistry and Center for Integrated Quantum Science and Technology University of Stuttgart Pfaffenwaldring 55 D‐70569 Stuttgart Germany
AuthorAffiliation_xml	– name: 1 Institute of Physical Chemistry and Center for Integrated Quantum Science and Technology University of Stuttgart Pfaffenwaldring 55 D‐70569 Stuttgart Germany
Author_xml	– sequence: 1 givenname: Samuel surname: Lenz fullname: Lenz, Samuel organization: University of Stuttgart – sequence: 2 givenname: Dennis surname: König fullname: König, Dennis organization: University of Stuttgart – sequence: 3 givenname: David surname: Hunger fullname: Hunger, David organization: University of Stuttgart – sequence: 4 givenname: Joris orcidid: 0000-0002-0855-8960 surname: Slageren fullname: Slageren, Joris email: slageren@ipc.uni-stuttgart.de organization: University of Stuttgart
BackLink	https://www.ncbi.nlm.nih.gov/pubmed/34106491$$D View this record in MEDLINE/PubMed
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Keywords	quantum technologies quantum memories organic radicals molecular quantum bits microwave pulse storage
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Snippet	Whilst quantum computing has recently taken great leaps ahead, the development of quantum memories has decidedly lagged behind. Quantum memories are essential...
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SubjectTerms	Coupling (molecular) Cryogenic temperature Electron spin Materials science microwave pulse storage molecular quantum bits organic radicals Quantum computing quantum memories quantum technologies Qubits (quantum computing) Repeaters Room temperature
Title	Room‐Temperature Quantum Memories Based on Molecular Electron Spin Ensembles
URI	https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fadma.202101673 https://www.ncbi.nlm.nih.gov/pubmed/34106491 https://www.proquest.com/docview/2555582521 https://www.proquest.com/docview/2539524372 https://pubmed.ncbi.nlm.nih.gov/PMC11469281
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