Universal holonomic quantum gates over geometric spin qubits with polarised microwaves

• Nagata, Kodai

• Kuramitani, Kouyou

• Sekiguchi, Yuhei

• Kosaka, Hideo

抄録

A microwave shares a nonintuitive phase called the geometric phase with an interacting electron spin after an elastic scattering. The geometric phase, generally discarded as a global phase, allows universal holonomic gating of an ideal logical qubit, which we call a geometric spin qubit, defined in the degenerate subspace of the triplet spin qutrit. We here experimentally demonstrate nonadiabatic and non-abelian holonomic quantum gates over the geometric spin qubit on an electron or nitrogen nucleus. We manipulate purely the geometric phase with a polarised microwave in a nitrogen-vacancy centre in diamond under a zero-magnetic field at room temperature. We also demonstrate a two-qubit holonomic gate to show universality by manipulating the electron−nucleus entanglement. The universal holonomic gates enable fast and fault-tolerant manipulation for realising quantum repeaters interfacing between universal quantum computers and secure communication networks.

収録刊行物

• Nature Communications

  Nature Communications 9 3227-, 2018-08-13

  Nature Publishing Group

キーワード

• General Physics and Astronomy
• General Biochemistry, Genetics and Molecular Biology
• General Chemistry
• Multidisciplinary

詳細情報

• CRID: 1050845762669409664
• NII論文ID: 120006501251
• NII書誌ID: AA12645905
• ISSN: 20411723
• DOI: 10.1038/s41467-018-05664-w
• Web Site: http://hdl.handle.net/10131/00011963
• Web Site: https://www.nature.com/articles/s41467-018-05664-w
• Web Site: https://www.nature.com/articles/s41467-018-05664-w.pdf
• 本文言語コード: en
• 資料種別: journal article
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