The HLRB cluster as quantum CISC compiler

T. Schulte-Herbrüggen, A. Spörl, K. Waldherr, T. Gradl, S. J. Glaser, T. Huckle

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

The project encompasses matrix method developments, tailored parallelization as well as cutting-edge applications exploiting the power of the HLRB-II cluster: fast matrix exponential algorithms using Chebyshev series are devised in view of calculating quantum dynamics of large systems. They outperform the standard Padé-approximation by a speed-up of approximately 30% in CPU time while obtaining even better accuracy. The routines are incorporated into a fully parallelized package of gradient-flow algorithms for optimal quantum control. As an application, here we present a quantum CISC compiler: it breaks large target unitary gates into modules of effective m-qubit (i.e. two-level system) interactions. We extend the standard restricted set of modules with m = 1,2 (RISC) to a scalable toolbox of multi-qubit optimal controls with m ≤ 10 forming modules of complex instruction sets (CISC). Typically, the instruction code ('experimental controls') by our quantum CISC compiler is some three to ten times faster than by RISC compilation thus dramatically saving the essential quantum coherences from unnecessary relaxative decay with time. This advantage of our method over standard universal gates is demonstrated for the indirect SWAP gate, the quantum Fourier transform as well as for multiply-controlled NOT gates.

Original languageEnglish
Title of host publicationHigh Performance Computing in Science and Engineering, Garching/Munich 2007 - Transactions of the 3rd Joint HLRB and KONWIHR Status and Result Workshop
PublisherKluwer Academic Publishers
Pages517-533
Number of pages17
ISBN (Print)9783540691815
DOIs
StatePublished - 2009
Event2007 3rd Joint HLRB and KONWIHR Result and Reviewing Workshop - Garching/Munich, Germany
Duration: 3 Dec 20074 Dec 2007

Publication series

NameHigh Performance Computing in Science and Engineering, Garching/Munich 2007 - Transactions of the 3rd Joint HLRB and KONWIHR Status and Result Workshop

Conference

Conference2007 3rd Joint HLRB and KONWIHR Result and Reviewing Workshop
Country/TerritoryGermany
CityGarching/Munich
Period3/12/074/12/07

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