John CollierNot surprising. James Leggett's work on the theory of weak measurements more or less implies this. I wrote in 1997 in a review of a book on hte direction of time: The chapters by physicists James Leggett and Phil Stamp deal with the distinction between...See More

Leonardo VaresiYes, but do you think that in quantum gravity theories applied for example to blacks holes, this fact would be a serious problem to be reassessed?Isn't it?

Jack SarfattiViolation of Heisenberg's Measurement-Disturbance Relationship by Weak Measurements Lee A. Rozema, Ardavan Darabi, Dylan H. Mahler, Alex Hayat, Yasaman Soudagar, Aephraim M. Steinberg (Submitted on 31 Jul 2012 (v1), last revised 15 Aug 2012 (this version, v2))

While there is a rigorously proven relationship about uncertainties intrinsic to any quantum system, often referred to as "Heisenberg's Uncertainty Principle," Heisenberg originally formulated his ideas in terms of a relationship between the precision of a measurement and the disturbance it must create. Although this latter relationship is not rigorously proven, it is commonly believed (and taught) as an aspect of the broader uncertainty principle. Here, we experimentally observe a violation of Heisenberg's "measurement-disturbance relationship", using weak measurements to characterize a quantum system before and after it interacts with a measurement apparatus. Our experiment implements a 2010 proposal of Lund and Wiseman to confirm a revised measurement-disturbance relationship derived by Ozawa in 2003. Its results have broad implications for the foundations of quantum mechanics and for practical issues in quantum mechanics.

Jack SarfattiCompare to: Subquantum Information and Computation

Antony Valentini (Submitted on 11 Mar 2002 (v1), last revised 12 Apr 2002 (this version, v2)) It is argued that immense physical resources - for nonlocal communication, espionage, and exponentially-fast computation - are hidden from us by quantum noise, and that this noise is not fundamental but merely a property of an equilibrium state in which the universe happens to be at the present time. It is suggested that 'non-quantum' or nonequilibrium matter might exist today in the form of relic particles from the early universe. We describe how such matter could be detected and put to practical use. Nonequilibrium matter could be used to send instantaneous signals, to violate the uncertainty principle, to distinguish non-orthogonal quantum states without disturbing them, to eavesdrop on quantum key distribution, and to outpace quantum computation (solving NP-complete problems in polynomial time). Comments: 10 pages, Latex, no figures. To appear in 'Proceedings of the Second Winter Institute on Foundations of Quantum Theory and Quantum Optics: Quantum Information Processing', ed. R. Ghosh (Indian Academy of Science, Bangalore, 2002). Second version: shortened at editor's request; extra material on outpacing quantum computation (solving NP-complete problems in polynomial time) Subjects: Quantum Physics (quant-ph) Journal reference: Pramana - J. Phys. 59 (2002) 269-277 DOI: 10.1007/s12043-002-0117-1 Report number: Imperial/TP/1-02/15 Cite as: arXiv:quant-ph/0203049 (or arXiv:quant-ph/0203049v2 for this version)