Quantum states entanglement issues

With this trick, one can now handle processes where entanglement can be varied at will. The issue is the representation of quantum states of systems having the same material content although a large number of autonomous subsystems are identifiable at a Fence. This is physics and chemistry unified by quantum physics. 

Quantum entanglement between matter-sustained quantum states and those presenting EM quantum states is one basic ingredient in discussing, for example, Eq. (31) in Scully et al. atom interferometer analysis. Also, in Section 4.2, a quantized EM field was used. Some key issues were not examined there below focus is on one issue concerning laboratory (real)/Fock space [5] connection. 

Einstein, Podolsky and Rosen (EPR) [Einstein 1935] asked the question of whether the quantum mechanical description of physical world is complete, giving the following example. Two-particles are in the quantum state showing strange correlations if one measures the position or momentum of one particle, one can predict with certainty the result of measuring their counterpart for the second particle. Thus, depending on which measurement is chosen for the first particle, the value of either the momentum or position can be predicted with arbitrary precision for the other particle. The later discussion has concerned the interpretation of the EPR paradox and its implications on quantum theory [Bohr 1935], Later, Bohm considered [Bohm 1951] two entangled spin-1/2 particles, which have become the center of attention on this EPR issue their... 

A second debate about the completeness of quantum theory did not benefit theoretical chemistry any better. Superposition of state functions which is allowed in quantum, but not in classical systems, dictates that the former is an entangled, non-local holistic theory [3]. The famous Einstein-Bohr debates, although centred around this issue, became so bogged down in side issues that they never squarely faced the real dilemma that a non-local (quan-... 

Indeed, in current liquid-state NMR experiments e 3 x 10-5 on n < 10 qubits. So we may conclude that in all liquid-state NMR experiments to-date no entangled state has been accessed [Braunstein 1999]. So that resolves one issue. Our first intuition was that entanglement is everything in quantum computation, but recall that the Jozsa-Linden theorem does not actually say that for mixed states. Maybe one can still obtain a speed-up without entanglement It turns out that this was no less controversial than the first question. 

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