scholarly journals Can quantum chaos enhance the stability of quantum computation?

2001 ◽  
Vol 34 (47) ◽  
pp. L681-L687 ◽  
Author(s):  
Tomaz Prosen ◽  
Marko Znidaric
1999 ◽  
Vol 10 (07) ◽  
pp. 1205-1228 ◽  
Author(s):  
E. V. KRISHNAMURTHY

The important requirements are stated for the success of quantum computation. These requirements involve coherent preserving Hamiltonians as well as exact integrability of the corresponding Feynman path integrals. Also we explain the role of metric entropy in dynamical evolutionary system and outline some of the open problems in the design of quantum computational systems. Finally, we observe that unless we understand quantum nondemolition measurements, quantum integrability, quantum chaos and the direction of time arrow, the quantum control and computational paradigms will remain elusive and the design of systems based on quantum dynamical evolution may not be feasible.


2007 ◽  
Vol 56 (7) ◽  
pp. 3709
Author(s):  
Ye Bin ◽  
Gu Rui-Jun ◽  
Xu Wen-Bo

2002 ◽  
Vol 9 (5) ◽  
pp. 1990-1996 ◽  
Author(s):  
M. H. Redi ◽  
J. L. Johnson ◽  
S. Klasky ◽  
J. Canik ◽  
R. L. Dewar ◽  
...  

2001 ◽  
Vol 65 (1) ◽  
Author(s):  
G. P. Berman ◽  
F. Borgonovi ◽  
F. M. Izrailev ◽  
V. I. Tsifrinovich

2001 ◽  
Author(s):  
M.H. Redi ◽  
J.L. Johnson ◽  
S. Klasky ◽  
J. Canik ◽  
R.L. Dewar ◽  
...  

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Junggi Yoon

Abstract We explore the quantum chaos of the coadjoint orbit action of diffeomorphism group of S1. We study quantum fluctuation around a saddle point to evaluate the soft mode contribution to the out-of-time-ordered correlator. We show that the stability condition of the semi-classical analysis of the coadjoint orbit found in [1] leads to the upper bound on the Lyapunov exponent which is identical to the bound on chaos proven in [2]. The bound is saturated by the coadjoint orbit Diff(S1)/SL(2) while the other stable orbit Diff(S1)/U(1) where the SL(2, ℝ) is broken to U(1) has non-maximal Lyapunov exponent.


2020 ◽  
Author(s):  
Abicumaran Uthamacumaran

Three cross-disciplinary branches of quantum science, namely that of: Quantum Chaos, Quantum Biology and Quantum Computation, are concisely addressed herein. The implications of these fields in the progression of science are emphasized. This critique is to be treated as a metacognition on currently contentious branches of science interwoven with the foundations of modern science: Quantum Mechanics, made accessible in layman terms to all systems thinkers.


1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.


1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.


Author(s):  
Godfrey C. Hoskins ◽  
V. Williams ◽  
V. Allison

The method demonstrated is an adaptation of a proven procedure for accurately determining the magnification of light photomicrographs. Because of the stability of modern electrical lenses, the method is shown to be directly applicable for providing precise reproducibility of magnification in various models of electron microscopes.A readily recognizable area of a carbon replica of a crossed-line diffraction grating is used as a standard. The same area of the standard was photographed in Phillips EM 200, Hitachi HU-11B2, and RCA EMU 3F electron microscopes at taps representative of the range of magnification of each. Negatives from one microscope were selected as guides and printed at convenient magnifications; then negatives from each of the other microscopes were projected to register with these prints. By deferring measurement to the print rather than comparing negatives, correspondence of magnification of the specimen in the three microscopes could be brought to within 2%.


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