Geometric Quantum Gates over Spin Qubits in Diamond

Kosaka Hideo, Nagata Kodai, Kuramitani Kouyou

doi:10.11316/butsuri.75.11_683

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Other Title

ダイヤモンド中のスピン量子ビットに対する幾何学的量子ゲート
ダイヤモンドチュウノスピンリョウシビットニタイスルキカガクテキリョウシゲート

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Description

<p>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 non-adiabatic 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 polarized microwave in a nitrogen-vacancy center 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.</p>

Journal

Butsuri

Butsuri 75 (11), 683-689, 2020-11-05

The Physical Society of Japan