Title:	Entanglement, intractability and no-signaling
Authors:	Srikanth, R.
Issue Date:	Jun-2010
Publisher:	IOP Publishing for the Royal Swedish Academy
Citation:	Physica Scripta, 2010, Vol.81, 065002
Abstract:	We consider the problem of deriving the no-signaling condition from the assumption that, as seen from a complexity theoretic perspective, the universe is not an exponential place. A fact that disallows such a derivation is the existence of polynomial superluminal gates, hypothetical primitive operations that enable superluminal signaling but not the efficient solution of intractable problems. It therefore follows, if this assumption is a basic principle of physics, either that it must be supplemented with additional assumptions to prohibit such gates or, improbably, that no-signaling is not a universal condition. Yet a gate of this kind is possibly implicit, although not recognized as such, in a decade-old quantum optical experiment involving position–momentum entangled photons. Here, we describe a feasible modified version of the experiment that appears to explicitly demonstrate the action of this gate. Some obvious counter-claims are shown to be invalid. We believe that the unexpected possibility of polynomial superluminal operations arises because some practically measured quantum optical quantities are not describable as standard quantum mechanical observables.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/3973
ISSN:	1402-4896 (Online) 0031-8949
Alternative Location:	http://arxiv.org/abs/1005.3449 http://dx.doi.org/10.1088/0031-8949/81/06/065002
Copyright:	2010 The Royal Swedish Academy of Sciences
Appears in Collections:	Research Papers (LAMP)

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