All-optical ultrafast arbitrary rotation of hole orbital qubits with direct phase control

• URL: http://arxiv.org/abs/2403.15295v2
• Date: Sun, 29 Sep 2024 09:18:53 GMT
• Title: All-optical ultrafast arbitrary rotation of hole orbital qubits with direct phase control
• Authors: Jun-Yong Yan, Liang Zhai, Hans-Georg Babin, Yuanzhen Li, Si-Hui Pei, Moritz Cygorek, Wei Fang, Fei Gao, Andreas D. Wieck, Arne Ludwig, Chao-Yuan Jin, Da-Wei Wang, Feng Liu,
• Abstract summary: orbital degree of freedom in optically active quantum dots has emerged as a promising candidate. We demonstrate arbitrary rotation of a hole orbital qubit with direct phase control using picosecond optical pulses. Results establish orbital states in solid-state quantum emitters as a viable resource for applications in high-speed quantum information processing.
• Score: 18.591036146528445
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• Abstract: Complete quantum control of a stationary quantum bit embedded in a quantum emitter is crucial for photonic quantum information technologies. Recently, the orbital degree of freedom in optically active quantum dots has emerged as a promising candidate. However, the essential ability to perform arbitrary rotations on orbital qubits remains elusive. Here, we demonstrate arbitrary rotation of a hole orbital qubit with direct phase control using picosecond optical pulses. This is achieved by successfully inducing stimulated Raman transitions within $\Lambda$ systems coupled via radiative Auger processes. The new capability enables direct control of polar and azimuth angles of the Bloch vector without requiring timed precession. Our results establish orbital states in solid-state quantum emitters as a viable resource for applications in high-speed quantum information processing.

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