Charge dynamics and spin blockade in a hybrid double quantum dot in silicon

Matias Urdampilleta, Anasua Chatterjee, Cheuk Chi Lo, Takashi Kobayashi, John Mansir, Sylvain Barraud, Andreas C. Betz, Sven Rogge, M. Fernando Gonzalez-Zalba, John J.L. Morton

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Electron spin qubits in silicon, whether in quantum dots or in donor atoms, have long been considered attractive qubits for the implementation of a quantum computer because of silicon's "semiconductor vacuum" character and its compatibility with the microelectronics industry. While donor electron spins in silicon provide extremely long coherence times and access to the nuclear spin via the hyperfine interaction, quantum dots have the complementary advantages of fast electrical operations, tunability, and scalability. Here, we present an approach to a novel hybrid double quantum dot by coupling a donor to a lithographically patterned artificial atom. Using gate-based rf reflectometry, we probe the charge stability of this double quantum-dot system and the variation of quantum capacitance at the interdot charge transition. Using microwave spectroscopy, we find a tunnel coupling of 2.7 GHz and characterize the charge dynamics, which reveals a charge T *2of 200 ps and a relaxation time T1 of 100 ns. Additionally, we demonstrate a spin blockade at the inderdot transition, opening up the possibility to operate this coupled system as a singlet-triplet qubit or to transfer a coherent spin state between the quantum dot and the donor electron and nucleus.

Original languageEnglish
Article number031024
JournalPhysical Review X
Issue number3
Publication statusPublished - 2015
Externally publishedYes


  • Condensed matter physics
  • Nanophysics
  • Quantum physics

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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