Coherent manipulation of semiconductor quantum bits with terahertz radiation

被引:229
作者
Cole, BE
Williams, JB
King, BT
Sherwin, MS [1 ]
Stanley, CR
机构
[1] Univ Calif Santa Barbara, Inst Quantum Engn Sci & Technol, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
[3] Univ Glasgow, Dept Elect & Elect Engn, Glasgow G12 8QQ, Lanark, Scotland
关键词
D O I
10.1038/35065032
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Quantum bits(1-5) (qubits) are the fundamental building blocks of quantum information processors, such as quantum computers(6). A qubit comprises a pair of well characterized quantum states that can in principle be manipulated quickly compared to the time it takes them to decohere by coupling to their environment(7). Much remains to be understood about the manipulation and decoherence of semiconductor qubits. Here we show that hydrogen-atom-like motional states of electrons bound to donor impurities in currently available semiconductors can serve as model qubits. We use intense pulses(8) of terahertz radiation to induce coherent, damped Rabi oscillations(9,10) in the population of two low-lying states of donor impurities in GaAs11-13. Our observations demonstrate that a quantum-confined extrinsic electron in a semiconductor can be coherently manipulated like an atomic electron, even while sharing space with similar to 10(5) atoms in its semiconductor host. We anticipate that this model system will be useful for measuring intrinsic decoherence processes, and for testing both simple and complex manipulations of semiconductor qubits.
引用
收藏
页码:60 / 63
页数:4
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