Ultrafast optical control of semiconductor spin qubits toward ...

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Spin Rotation with Single Optical Pulses • A single broadband optical pulse can implement an arbitrary one-bit gate with fidelity of 0.999. If an effective Rabi frequency Numerical simulation based on the three-level master equation 100fs /2 - pulse rotation angle is proportional to pulse energy • A system clock is provided by the pulse arrival time from the mode-locked laser. 100fs -pulse Arbitrary single qubit gates SU(2) can be implemented in a half period of Larmor oscillation. Theory: S. Clark et al., Phys. Rev. Lett. 99, 040501 (2007) Experiment with an ensemble of donor spins : K.M. Fu et al., Nature Physics 4, 780 (2008) 12
Single QD Experiment: Coherent Rabi Oscillations Circularly-polarized 4 ps Rotation Pulse δ e = 26 GHz BW = 110 GHz Δ = 270 GHz Population in D. Press et al., Nature 456, 218 (2008) (cf. J. Berezovsky et al., Science 320, 349 (2008)) 13
Page 1 and 2: Ultrafast Optical Control of Semico
Page 3 and 4: Outline • Physical qubits Optica
Page 5 and 6: Magnetic Spectrum of Charged Excito
Page 11: Outline • Physical qubits Optica
Page 17 and 18: Dissipative, Measurement-Free and D
Page 19 and 20: Differential Phase Shift Projective
Page 23 and 24: Indistinguishable Single Photons fr
Page 25 and 26: Clean Atomic Systems in Semiconduct
Page 27 and 28: Summary and Outlook Essential eleme
Page 29 and 30: Measurement of Nuclear Polarization
Page 31 and 32: The Dependence of Decoherence Time
Page 33 and 34: Entanglement Distribution with Sing

Ultrafast optical control of semiconductor spin qubits toward ...

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