Differential topology of adiabatically controlled quantum processes

Differential topology of adiabatically controlled quantum processes It is shown that in a controlled adiabatic homotopy between two Hamiltonians, H 0 and H 1, the gap or “anti-crossing” phenomenon can be viewed as the development of cusps and swallow tails in the region of the complex plane where two critical value curves of the quadratic map associated with the numerical range of H 0 + i H 1 come close. The “near crossing” in the energy level plots happens to be a generic situation, in the sense that a crossing is a manifestation of the quadratic numerical range map being unstable in the sense of differential topology. The stable singularities that can develop are identified and it is shown that they could occur near the gap, making those singularities of paramount importance. Various applications, including the quantum random walk, are provided to illustrate this theory. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Differential topology of adiabatically controlled quantum processes

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Publisher
Springer Journals
Copyright
Copyright © 2012 by Springer Science+Business Media, LLC
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-012-0445-0
Publisher site
See Article on Publisher Site

Abstract

It is shown that in a controlled adiabatic homotopy between two Hamiltonians, H 0 and H 1, the gap or “anti-crossing” phenomenon can be viewed as the development of cusps and swallow tails in the region of the complex plane where two critical value curves of the quadratic map associated with the numerical range of H 0 + i H 1 come close. The “near crossing” in the energy level plots happens to be a generic situation, in the sense that a crossing is a manifestation of the quadratic numerical range map being unstable in the sense of differential topology. The stable singularities that can develop are identified and it is shown that they could occur near the gap, making those singularities of paramount importance. Various applications, including the quantum random walk, are provided to illustrate this theory.

Journal

Quantum Information ProcessingSpringer Journals

Published: Sep 2, 2012

References

  • Consistency of the adiabatic theorem
    Sarandy, M.S.; Wu, L.A.; Lidar, D.A.
  • Convexity of the joint numerical range: topological and differential geometric viewpoints
    Gutkin, E.; Jonckheere, E.A.; Karow, M.

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