(08-1006) AACP Seminar Series, Prof. Daniel Lidar, USC

Event Details
  • Date/Time:
    • Monday October 6, 2008
      7:30 pm - 9:00 pm
  • Location: G011 MS&E Bldg
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Contact
Shirley Tomes
Chemistry & Biochemistry
Contact Shirley Tomes
404-894-0591
Summaries

Summary Sentence: Prof. Daniel Lidar, University of Southern California

Full Summary: The AACP Seminar Series presents Prof. Daniel Lidar, University of Southern California Preserving and extending quantum coherence: from the spin echo effect to fault tolerant quantum computation

The AACP Seminar Series presents Prof. Daniel Lidar, University of Southern California

Preserving and extending quantum coherence: from the spin echo effect to fault tolerant quantum computation

Dynamical decoupling pulse sequences have been used to extend coherence times in quantum systems ever since the discovery of the spin-echo effect. But while for good reasons the NMR community has typically been content with moderate line narrowing, in quantum computing extremely high levels of coherence are required in order to perform meaningful computational tasks. Such high levels of coherence are also important in structural biology, due to spectral crowding in protein NMR spectroscopy. In this talk I will describe a method of recursively concatenated dynamical decoupling pulses, designed to overcome both decoherence and operational errors [1]. For bounded-strength, non-Markovian environments, such as for the spin-bath that arises in electron- and nuclear-spin based solid-state quantum computer proposals, it is strictly advantageous to use concatenated, as opposed to standard periodic dynamical decoupling pulse sequences. Namely, the concatenated scheme is both fault-tolerant and super-polynomially more efficient, at equal cost [2,3]. Preliminary experimental results on NMR of 13C in adamantene (due to Dieter Suter, Dortmund), and NMR of the 31P donor in Si (due to Steve Lyon, Princeton), demonstrating the advantages of concatenated decoupling, will also be presented. Time permitting, I will describe our recent results on the construction of a universal set of quantum logic gates whose fidelity can be kept arbitrarily high for essentially arbitrarily long times in the presence of coupling to a spin bath, by use of concatenated decoupling.

References:
[1] K. Khodjasteh and D.A. Lidar, "Fault-Tolerant Quantum Dynamical Decoupling", Phys. Rev. Lett. 95, 180501 (2005).
[2] K. Khodjasteh and D.A. Lidar, "Performance of Deterministic Dynamical Decoupling Schemes: Concatenated and Periodic Pulse Sequences", Phys. Rev. A 75, 062310 (2007)
[3] K. Khodjasteh and D.A. Lidar, "Rigorous Bounds on the Performance of a Hybrid Dynamical Decoupling-Quantum Computing Scheme", Phys. Rev. A 78, 012355 (2008).

For more information contact Prof. Ken Brown (404-385-3124).

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School of Chemistry and Biochemistry

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Categories
Seminar/Lecture/Colloquium
Keywords
Biochemistry, chemistry
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  • Created By: Shirley Tomes
  • Workflow Status: Published
  • Created On: Jul 23, 2008 - 8:00pm
  • Last Updated: Oct 7, 2016 - 9:57pm