Template:Publications Highlight

• Y. Gao and M.F. DeCamp "Generation of acoustic pulses from a photo-acoustic transducer measured by time-resolved x-ray diffraction" Applied Physics Letters 100 191903 (2012) This work studied the generation of picosecond acoustic pulses generated by ultrafast optical excitation of a photo-acoustic transducer using time-resolved x-ray diffraction. The resulting pump-probe spectra reveal that the spatiotemporal structure of the acoustic pulse is bipolar with acoustic wavevectors up to inverse of the film thickness.

• SE Economou, JI Climente, A Badolato, AS Bracker, D Gammon, MF Doty "Scalable qubit architecture based on holes in quantum dot molecules" Physical Review B, 86 085319 (2012) Spins confined in quantum dots are a leading candidate for solid-state quantum bits that can be coherently controlled by optical pulses. The use of hole spins allows the suppression of decoherence via hyperfine interactions and enables coherent spin rotations using Raman transitions mediated by a hole-spin-mixed optically excited state. Because the spin mixing is present only in the optically excited state, dephasing and decoherence are strongly suppressed in the ground states that define the qubits and nondestructive readout is possible. We present the qubit and device designs and analyze the wavelength tunability and fidelity of gate operations that can be implemented using this strategy. We then present experimental and theoretical progress toward implementing this design.