Complete coherent control of a single electron spin in a quantum dot using ultrafast optical pulses

David Press; Thaddeus D. Ladd; Bingyang Zhang; Yoshihisa Yamamoto

doi:10.1117/12.813784

2 February 2009 Complete coherent control of a single electron spin in a quantum dot using ultrafast optical pulses

David Press, Thaddeus D. Ladd, Bingyang Zhang, Yoshihisa Yamamoto

Proceedings Volume 7225, Advanced Optical Concepts in Quantum Computing, Memory, and Communication II; 722503 (2009) https://doi.org/10.1117/12.813784
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

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.

Citation Download Citation

David Press, Thaddeus D. Ladd, Bingyang Zhang, and Yoshihisa Yamamoto "Complete coherent control of a single electron spin in a quantum dot using ultrafast optical pulses", Proc. SPIE 7225, Advanced Optical Concepts in Quantum Computing, Memory, and Communication II, 722503 (2 February 2009); https://doi.org/10.1117/12.813784

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