Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/41932
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- Title
- Quantum causal histories in the light of quantum information
- Related
- Physical review D. Particles, fields, gravitation, and cosmology, Vol. 75, Issue 8, p.084001-1-084001-8
- DOI
- 10.1103/PhysRevD.75.084001
- Publisher
- American Physical Society
- Date
- 2007
- FoR/RFCD Code(s)
-
010505 Mathematical Aspects of Quantum and Conformal Field Theory, Quantum Gravity and String Theory
020603 Quantum Information, Computation and Communication
- Author/Creator
- Livine, Etera R
- Author/Creator
- Terno, Daniel R
- Description
- We use techniques of quantum information theory to analyze the quantum causal histories approach to quantum gravity. While it is consistent to introduce closed timelike curves (CTCs), they cannot generically carry independent degrees of freedom. Moreover, if the effective dynamics of the chronology-respecting part of the system is linear, it should be completely decoupled from the CTCs. In the absence of a CTC, not all causal structures admit the introduction of quantum mechanics. It is possible for those and only those causal structures that can be represented as quantum computational networks. Dynamics of the subsystems should not be unitary or even completely positive. However, we show that other commonly made assumptions ensure the complete positivity of the reduced dynamics.
- Description
- 8 page(s)
- Subject Keyword
- 010505 Mathematical Aspects of Quantum and Conformal Field Theory, Quantum Gravity and String Theory
- Subject Keyword
- 020603 Quantum Information, Computation and Communication
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Physics
- Identifier
- http://hdl.handle.net/1959.14/41932
- Identifier
- ISSN:1550-7998
- Identifier
- mq-rm-2007004106
- Language
- eng
- Rights
- Copyright 2007 by The American Physical Society. Reprinted from Physical review D.
- Full Text
- Reviewed
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