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Message: <blockquote data-quote="Chathurangaabey" data-source="post: 16828866" data-attributes="member: 7201">I just read this paper.<a href="http://www.nature.com/ncomms/2014/140619/ncomms5145/full/ncomms5145.html" target="_blank">http://www.nature.com/ncomms/2014/140619/ncomms5145/full/ncomms5145.html</a>.ABSTRACT:Experimental simulation of closed timelike curvesMartin Ringbauer1,2, Matthew A. Broome1,2, Casey R. Myers1, Andrew G. White1,2 & Timothy C. Ralph2Closed timelike curves are among the most controversial features of modern physics. Aslegitimate solutions to Einstein’s field equations, they allow for time travel, which instinctivelyseems paradoxical. However, in the quantum regime these paradoxes can be resolved, leavingclosed timelike curves consistent with relativity. The study of these systems thereforeprovides valuable insight into nonlinearities and the emergence of causal structures inquantum mechanics—essential for any formulation of a quantum theory of gravity. Here weexperimentally simulate the nonlinear behaviour of a qubit interacting unitarily with an olderversion of itself, addressing some of the fascinating effects that arise in systems traversing aclosed timelike curve. These include perfect discrimination of non-orthogonal states and,most intriguingly, the ability to distinguish nominally equivalent ways of preparing purequantum states. Finally, we examine the dependence of these effects on the initial qubit state,the form of the unitary interaction and the influence of decoherence.DISCUSSION:Quantum simulation is a versatile and powerful tool forinvestigating quantum systems that are hard or even impossibleto access in practice20. Although no CTCs have been discoveredto date, quantum simulation nonetheless enables us to studytheir unique properties and behaviour. Here we simulated theimmediate adaption of rCTC to changes in the CTC’senvironment and in particular the effect of different forms ofdecoherence. We also show that the nonlinearity inherent in thesystem is in fact not uniform (as shown in Fig. 3), suggesting thatnonlinear effects only become apparent in certain scenarios andfor a specific set of measurements.Moreover, we find intriguing differences with respect tonominally equivalent ways of pure state preparation. Althoughacknowledged in ref. 29, this feature has not been furtherinvestigated in the present literature. Importantly, this effectarises due to consistency with relativity, in contrast to the similareffect for mixed quantum states discussed earlier, which is a directresult of the nonlinearity of the system7.Our study of the Deutsch model provides insights into the roleof causal structures and nonlinearities in quantum mechanics,which is essential for an eventual reconciliation with generalrelativity.____________________________________________________________________this is just a quantum simulation of a single qbit. So macroscopic bodies can't behave like that.  එකියන්නේ ඕකෙන් අපිට කාලය හරහා යන්න පුළුවන්කමක් ලැබෙයි කියලා කියන්න බෑ...</blockquote>

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