This is due to distinguishability,as one would then know which path the object took from the observedstate of the outer electron.If one now goes a step further and argues that distinguishability notonly stops interference, but actually triggers the collapse of the wave func-tion (is itself the act of measurement), one may have another view on thequestion of where the boundary between the quantum and classical worldsoccurs. Taking as the model of a ‘macroscopic’ system, the interference of largemolecules, which has been performed if the energy of an outer electronis modified on one path alone (which is not enough to wash out the inter-ference pattern), interference is still lost.
The above proposal would seem more plausible if it can be demonstratedthat no paradox arises from its supposed ability to communicate ‘in-stantly’ over indefinite distances namely, that no use can be made ofa communication to alter events in the past.The collapse of the wave-function upon the act of measurement haslong been a dilemma, and one seeks to explain when and how thereduction occurs, if at all.A possible clarification to the usual quantum measurement axiommight be that the probabilistic collapse happens when distinguishabil-ity occurs, and that ‘instantaneous’ might make more sense if relative toa preferred frame (a quantum-ether). Half-Duplex Quantum Communicator Absence of Paradox The above proposal, for simplicity, was a one way transmission device, butthis can be easily duplicated for a full-duplex device or simply extendedfor half-duplex. So a faster than light transmitter of information (but notenergy or matter) might be possible. uantum TransmitterThe recombination can be arranged to constructively, or destructivelyinterfere, depending on a phase shifter in one of the two paths.If the sender arranges for constructive interference then some of theparticles will be ‘taken up’ by the sender, but none if destructive inter-ference is arranged in this way the intensity of the receivers beam mightbe controlled. ∗ A similar mechanism has been proposed to augment the ability of a quantum com-puter. To try and implement this, imagine a beam splitting mechanism thatbreaks the beam into two arms that can be widely separated, and thenagain splits and recombines one of the two resulting arms. The conservation of a particle in quantum theory (unitarity) might suggesta possible mechanism, since the destructive interference in one part of thesystem will imply a greater probability of locating the particle in anotherpart, no matter how dispersed the system has become. It has long been wondered if faster than light communication might bepossible and the collapse of the quantum wave-function, upon mea-surement, might be utilized to achieve this, with due concern for anyparadoxes that might result.Firstly, there is no direct violation of special relativity since it is thequantum wave-function that collapses and no energy or matter travels atfaster than light speed. Shiekh ∗ Din´e College, Tsaile, Arizona, U.S.A.įaster than light communication might be possible using the collapseof the quantum wave-function without any accompanying paradoxes. A p r Faster than Light QuantumCommunicationĪ.Y.
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