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Proceedings Paper

Complete coherent control of a single electron spin in a quantum dot using ultrafast optical pulses
Author(s): David Press; Thaddeus D. Ladd; Bingyang Zhang; Yoshihisa Yamamoto
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Paper Abstract

We demonstrate a complete set of fast, all-optical single-qubit operations on a single electron spin confined in a semiconductor quantum dot (QD). Optical initialization and measurement of the single spin are accomplished by optical pumping in a 3.4 ns timescale with 92±7% fidelity. The spin is coherently manipulated by a single red-detuned broadband laser pulse with 4 picosecond duration. We achieve over six complete Rabi oscillations between the two spin states by varying the rotation pulse's intensity. The fidelity of π/2 and π rotations both exceed 90%. Next we use two sequential rotation pulses, separated by a variable time delay, to demonstrate a complete set of Ramsey fringes. This two-pulse sequence is sufficient to achieve an arbitrary rotation of the spin and thus serves as a universal single-qubit gate.

Paper Details

Date Published: 2 February 2009
PDF: 8 pages
Proc. SPIE 7225, Advanced Optical Concepts in Quantum Computing, Memory, and Communication II, 722503 (2 February 2009); doi: 10.1117/12.813784
Show Author Affiliations
David Press, Stanford Univ. (United States)
Thaddeus D. Ladd, Stanford Univ. (United States)
National Institute of Informatics (Japan)
Bingyang Zhang, Stanford Univ. (United States)
Yoshihisa Yamamoto, Stanford Univ. (United States)
National Institute of Informatics (Japan)


Published in SPIE Proceedings Vol. 7225:
Advanced Optical Concepts in Quantum Computing, Memory, and Communication II
Zameer U. Hasan; Alan E. Craig; Philip R. Hemmer, Editor(s)

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