Ultralong spin coherence time in isotopically engineered diamond

As quantum mechanics ventures into the world of applications and engineering, materials science faces the necessity to design matter to quantum grade purity. For such materials, quantum effects define their physical behaviour and open completely new (quantum) perspectives for applications. Carbon-ba...

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Bibliographic Details
Published in:	Nature materials Vol. 8; no. 5; pp. 383 - 387
Main Authors:	Jelezko, Fedor, Wrachtrup, Jörg, Balasubramanian, Gopalakrishnan, Neumann, Philipp, Twitchen, Daniel, Markham, Matthew, Kolesov, Roman, Mizuochi, Norikazu, Isoya, Junichi, Achard, Jocelyn, Beck, Johannes, Tissler, Julia, Jacques, Vincent, Hemmer, Philip R
Format:	Journal Article
Language:	English
Published:	London Nature Publishing Group UK 01-05-2009 Nature Publishing Group
Subjects:	Biomaterials Carbon Isotopes Chemical engineering Chemical Engineering - methods Chemistry and Materials Science Condensed Matter Physics Diamond - chemistry Diamonds Engineering Sciences Isotopes letter Magnetic fields Materials Science Nanotechnology Nitrogen - chemistry Optical and Electronic Materials Physics Quantum Theory
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Summary:	As quantum mechanics ventures into the world of applications and engineering, materials science faces the necessity to design matter to quantum grade purity. For such materials, quantum effects define their physical behaviour and open completely new (quantum) perspectives for applications. Carbon-based materials are particularly good examples, highlighted by the fascinating quantum properties of, for example, nanotubes or graphene. Here, we demonstrate the synthesis and application of ultrapure isotopically controlled single-crystal chemical vapour deposition (CVD) diamond with a remarkably low concentration of paramagnetic impurities. The content of nuclear spins associated with the 13C isotope was depleted to 0.3% and the concentration of other paramagnetic defects was measured to be <1013 cm−3. Being placed in such a spin-free lattice, single electron spins show the longest room-temperature spin dephasing times ever observed in solid-state systems (T2=1.8 ms). This benchmark will potentially allow observation of coherent coupling between spins separated by a few tens of nanometres, making it a versatile material for room-temperature quantum information processing devices. We also show that single electron spins in the same isotopically engineered CVD diamond can be used to detect external magnetic fields with a sensitivity reaching 4 nT Hz−1/2 and subnanometre spatial resolution.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1476-1122 1476-4660
DOI:	10.1038/nmat2420