Browsing by Author "Kim, J"

Now showing 1 - 6 of 6
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    Designing a million-qubit quantum computer using a resource performance simulator
    (ACM Journal on Emerging Technologies in Computing Systems, 2015-12-01) Ahsan, M; Van Meter, R; Kim, J
    © 2015 ACM 1550-4832/2015/12-ART4615.00.The optimal design of a fault-Tolerant quantum computer involves finding an appropriate balance between the burden of large-scale integration of noisy components and the load of improving the reliability of hardware technology. This balance can be evaluated by quantitatively modeling the execution of quantum logic operations on a realistic quantum hardware containing limited computational resources. In this work, we report a complete performance simulation software tool capable of (1) searching the hardware design space by varying resource architecture and technology parameters, (2) synthesizing and scheduling a fault-Tolerant quantum algorithm within the hardware constraints, (3) quantifying the performance metrics such as the execution time and the failure probability of the algorithm, and (4) analyzing the breakdown of these metrics to highlight the performance bottlenecks and visualizing resource utilization to evaluate the adequacy of the chosen design. Using this tool, we investigate a vast design space for implementing key building blocks of Shor's algorithm to factor a 1,024-bit number with a baseline budget of 1.5 million qubits. We show that a trapped-ion quantum computer designed with twice as many qubits and one-Tenth of the baseline infidelity of the communication channel can factor a 2,048-bit integer in less than 5 months.
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    EMPIRICAL-MODEL PARTICULARITIES AND BELIEF IN THE NATURAL RATE HYPOTHESIS
    (JOURNAL OF ECONOMETRICS, 1995-05) Kim, J; De Marchi, N; Morgan, MS
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    Error compensation of single-qubit gates in a surface-electrode ion trap using composite pulses
    (Physical Review A - Atomic, Molecular, and Optical Physics, 2015-12-16) Mount, E; Kabytayev, C; Crain, S; Harper, R; Baek, SY; Vrijsen, G; Flammia, ST; Brown, KR; Maunz, P; Kim, J
    © 2015 American Physical Society.The fidelity of laser-driven quantum logic operations on trapped ion qubits tend to be lower than microwave-driven logic operations due to the difficulty of stabilizing the driving fields at the ion location. Through stabilization of the driving optical fields and use of composite pulse sequences, we demonstrate high-fidelity single-qubit gates for the hyperfine qubit of a Yb+171 ion trapped in a microfabricated surface-electrode ion trap. Gate error is characterized using a randomized benchmarking protocol and an average error per randomized Clifford group gate of 3.6(3)×10-4 is measured. We also report experimental realization of palindromic pulse sequences that scale efficiently in sequence length.
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    Independent individual addressing of multiple neutral atom qubits with a micromirror-based beam steering system
    (Applied Physics Letters, 2010-09-27) Knoernschild, C; Zhang, XL; Isenhower, L; Gill, AT; Lu, FP; Saffman, M; Kim, J
    We demonstrate a scalable approach to addressing multiple atomic qubits for use in quantum information processing. Individually trapped 87Rb 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. © 2010 American Institute of Physics.
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    Perspectives of women in prostitution diversion program on DNA collection for a high-risk DNA database
    (International Journal of Criminal Justice Sciences, 2017-01-01) Katsanis, SH; Felini, M; Kim, J; Minear, M; Chandrasekharan, S; Wagner, JK
    © 2017 International Journal of Criminal Justice Sciences. DNA can be collected from women at high risk of violent crime as a pre-emptive biometric for post-mortem identification. We conducted focus groups with women in a prostitution diversion program that offers preemptive DNA collection. In general, the women supported the program but voiced concern for law enforcement collecting DNA. These data provide insights into the challenges of collecting DNA from women whom law enforcement might consider alternately to be victims or vilified. Hearing the voices of these women provides the forensic community an opportunity to design programs to minimize harm and maximize utility of DNA for victim identification.
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    Surface-electrode point Paul trap
    (Physical Review A - Atomic, Molecular, and Optical Physics, 2010-10-12) Kim, TH; Herskind, PF; Kim, T; Kim, J; Chuang, IL
    We present a model as well as experimental results for a surface electrode radiofrequency Paul trap that has a circular electrode geometry well suited for trapping single ions and two-dimensional planar ion crystals. The trap design is compatible with microfabrication and offers a simple method by which the height of the trapped ions above the surface may be changed in situ. We demonstrate trapping of single Sr88+ ions over an ion height range of 200-1000 μm for several hours under Doppler laser cooling and use these to characterize the trap, finding good agreement with our model. © 2010 The American Physical Society.