Dynamical Decoupling of a Geometric Qubit

• Sekiguchi, Yuhei

• Komura, Yusuke

• Kosaka, Hideo

抄録

Quantum bits or qubits naturally decohere by becoming entangled with uncontrollable environments. Dynamical decoupling is, therefore, required to disentangle qubits from an environment by periodically reversing the qubit bases, but this causes rotation error to accumulate. Whereas a conventional qubit is rotated within the SU(2) two-level system, a geometric qubit defined in the degenerate subspace of a V-shaped SU(3) three-level system is geometrically rotated via the third ancillary level to acquire a geometric phase. We demonstrate that simply by introducing detuning, the dynamical decoupling of the geometric qubit on a spin triplet electron in a nitrogen-vacancy center in diamond can be made to spontaneously suppress error accumulation. The geometric dynamical decoupling extends the coherence time of the geometric qubit up to 1.9 ms, limited by the relaxation time, with 128 decoupling gates at room temperature. Our technique opens a route to holonomic quantum memory for use in various quantum applications requiring sequential operations.

収録刊行物

• Physical Review Applied

  Physical Review Applied 12 (5), 051001-, 2019-11

  APS

キーワード

• Geometric & topological phases
• Open quantum systems & decoherence
• Quantum gates
• Quantum information with solid state qubits
• Quantum memories
• Nitrogen vacancy centers in diamond
• Polarization
• Optically detected magnetic resonance

詳細情報

• CRID: 1050845763997079040
• NII論文ID: 120006770969
• ISSN: 23317019
• DOI: 10.1103/physrevapplied.12.051001
• Web Site: http://hdl.handle.net/10131/00012839
• Web Site: https://link.aps.org/article/10.1103/PhysRevApplied.12.051001
• Web Site: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevApplied.12.051001/fulltext
• 本文言語コード: en
• 資料種別: journal article
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