Highly coherent spin states in carbon nanotubes coupled to cavity photons
Journal article, 2019

Spins confined in quantum dots are considered as a promising platform for quantum information processing. While many advanced quantum operations have been demonstrated, experimental as well as theoretical efforts are now focusing on the development of scalable spin quantum bit architectures. One particularly promising method relies on the coupling of spin quantum bits to microwave cavity photons. This would enable the coupling of distant spins via the exchange of virtual photons for two qubit gate applications, which still remains to be demonstrated with spin qubits. Here, we use a circuit QED spin-photon interface to drive a single electronic spin in a carbon nanotube-based double quantum dot using cavity photons. The microwave spectroscopy allows us to identify an electrically controlled spin transition with a decoherence rate which can be tuned to be as low as 250 kHz. We show that this value is consistent with the expected hyperfine coupling in carbon nanotubes. These coherence properties, which can be attributed to the use of pristine carbon nanotubes stapled inside the cavity, should enable coherent spin-spin interaction via cavity photons and compare favorably to the ones recently demonstrated in Si-based circuit QED experiments. Our clean and controlled nano-assembly technique of carbon nanotubes in the cavity could be further improved by purified C-12 growth to get rid of the nuclear spins resulting in an even higher spin coherence.


T. Cubaynes

Paris Diderot University

M. R. Delbecq

Paris Diderot University

M. C. Dartiailh

Paris Diderot University

R. Assouly

Paris Diderot University

M. M. Desjardins

Paris Diderot University

L. C. Contamin

Paris Diderot University

Laure Bruhat

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Z. Leghtas

Université Paris PSL


Paris Diderot University

F. Mallet

Paris Diderot University

A. Cottet

Paris Diderot University

T. Kontos

Paris Diderot University


2056-6387 (ISSN)

Vol. 5 47

Subject Categories

Atom and Molecular Physics and Optics

Condensed Matter Physics



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