Felix Lu
Duke University
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Publication
Featured researches published by Felix Lu.
Applied Physics Letters | 2010
Caleb Knoernschild; Larry Isenhower; Alex T. Gill; Felix Lu; Mark Saffman; Jungsang Kim
We demonstrate a scalable approach to addressing multiple atomic qubits for use in quantum information processing. Individually trapped R87b atoms in a linear array are selectively manipulated with a single laser guided by a microelectromechanical beam steering system. Single qubit oscillations are shown on multiple sites at frequencies of ≃3.5 MHz with negligible crosstalk to neighboring sites. Switching times between the central atom and its closest neighbor were measured to be 6–7 μs while moving between the central atom and an atom two trap sites away took 10–14 μs.
Optics Letters | 2008
Caleb Knoernschild; Changsoon Kim; Bin Liu; Felix Lu; Jungsang Kim
To provide scalability to quantum information processors utilizing trapped atoms or ions as quantum bits (qubits), the capability to address multiple individual qubits in a large array is needed. Microelectromechanical systems (MEMS) technology can be used to create a flexible and scalable optical system to direct the necessary laser beams to multiple qubit locations. We developed beam steering optics using controllable MEMS mirrors that enable one laser beam to address multiple qubit locations in a two-dimensional trap lattice. MEMS mirror settling times of approximately 10 micros were demonstrated, which allow for fast access time between qubits.
Optics Express | 2009
Caleb Knoernschild; Changsoon Kim; Felix Lu; Jungsang Kim
We present a beam steering system based on micro-electromechanical systems technology that features high speed steering of multiple laser beams over a broad wavelength range. By utilizing high speed micromirrors with a broadband metallic coating, our system has the flexibility to simultaneously incorporate a wide range of wavelengths and multiple beams. We demonstrate reconfiguration of two independent beams at different wavelengths (780 and 635 nm) across a common 5x5 array with 4 micros settling time. Full simulation of the optical system provides insights on the scalability of the system. Such a system can provide a versatile tool for applications where fast laser multiplexing is necessary.
Applied Physics Letters | 2007
Kyle S. McKay; Felix Lu; Jungsang Kim; Changhyun Yi; April S. Brown; Aaron R. Hawkins
p-type InGaAs∕Si heterojunctions were fabricated through a wafer fusion bonding process. The relative band alignment between the two materials at the heterointerface was determined using current-voltage (I-V) measurements and applying thermionic emission-diffusion theory. The valence and conduction band discontinuities for the InGaAs∕Si interface were determined to be 0.48 and −0.1eV, respectively, indicating a type-II band alignment.
IEEE\/ASME Journal of Microelectromechanical Systems | 2010
Caleb Knoernschild; Changsoon Kim; Christopher W. Gregory; Felix Lu; Jungsang Kim
Optical power tolerance on micromirrors is a critical aspect of many high-power optical systems. Absorptive heating can negatively impact the performance of an optical system by altering the micromirrors curvature during operation. This can lead to shifts in the beam waist locations or imaging planes within a system. This paper describes a scheme to measure the impact of mirror heating by optical power and determine the power tolerances of micromirrors with gold and aluminum coatings using a 532-nm laser. Results are compared with an analytical model of thermally induced stress and optical absorptive heating. Experimental data shows that gold-coated mirrors are able to handle 40 mW of optical power with a beam waist displacement of less than 20% of the output Rayleigh length, while aluminum-coated mirrors can tolerate 125 mW. Measured data along with modeling suggest that, with proper metal coating, optical powers greater than 1 W should not adversely affect the system performance.
conference on lasers and electro optics | 2007
Changsoon Kim; Caleb Knoernschild; Bin Liu; Kyle S. McKay; Felix Lu; Jungsang Kim
Scalable quantum information processing in ion traps or neutral atoms requires highly integrated and functional optical systems for qubit manipulation and detection. We discuss and demonstrate integrated optics technologies that are relevant for this application.
Bulletin of the American Physical Society | 2010
Caleb Knoernschild; Felix Lu; Hoon Ryu; Michael Feng; Jungsang Kim
Bulletin of the American Physical Society | 2008
Caleb Knoernschild; Changsoon Kim; Felix Lu; Jungsang Kim
Frontiers in Optics | 2007
Kyle S. McKay; Felix Lu; Jungsang Kim; Henry H. Hogue
Bulletin of the American Physical Society | 2007
Caleb Knoernschild; Changsoon Kim; Felix Lu; Bin Liu; Jungsang Kim