Question: Quantum field theory unified what two theory's?
About the article "Physics", section "Difference between classical and modern physics".

Candidate passages:
 Topological quantum field theory (TQFT) Axiomatic quantum field theory Local quantum field theory Algebraic quantum field theory  
Quantum technology is a new field of physics and engineering, which transitions some of the stranger features of quantum mechanics, especially quantum entanglement and most recently quantum tunneling, into practical applications such as quantum computing, quantum cryptography, quantum simulation, quantum metrology, quantum sensing, and quantum imaging.
The field of quantum technology was first outlined in a 1997 book by Gerard J. Milburn, which was then followed by a 2003 article by Jonathan P. Dowling and Gerard J. Milburn, as well as a 2003 article by David Deutsch.
The field of quantum technology has benefited immensely from the influx of new ideas from the field of quantum information processing, particularly quantum computing.
Disparate areas of quantum physics, such as quantum optics, atom optics, quantum electronics, and quantum nanomechanical devices, have been unified under the search for a quantum computer and given a common language, that of quantum information theory.  
 Quantum electrodynamics – Quantum field theory – Quantum mechanics – Quantum physics – Quark –  
Some quantum theories of gravity posit a spin-2 quantum field that is quantized, giving rise to gravitons.
In string theory and quantum field theories, one starts with quantized excitations on top of a classically fixed background.
These theories are thus described as background dependent.
The excitations are the quanta of the associated fields (photons, gravitons, ...).
String theory's claim as a theory of quantum gravity is its prediction of a massless spin-2 particle, the graviton, whose interactions in the classical limit reproduce general relativity.
While string theory is "background dependent", the choice of background, like a gauge fixing, does not affect the physical predictions.
This is not the case, however, for quantum field theories, which give different predictions for different backgrounds.
In contrast, loop quantum gravity, like general relativity, is manifestly background independent, eliminating the (in some sense) "redundant" background required in string theory.
Loop quantum gravity, like string theory, also aims to overcome the nonrenormalizable divergences of quantum field theories.LQG never introduces a background and excitations living on this background, so LQG does not use gravitons as building blocks.
Instead one expects that one may recover a kind of semiclassical limit or weak field limit where something like "gravitons" will show up again.
So in contrast to any other QFT and string theory where the "gravitons" are the fundamental (mathematical and physical) entities in LQG the gravitons are not fundamental but only to be considered in a certain limited approximation.LQG differs from string theory in that it is formulated in 3 and 4 dimensions and without supersymmetry or Kaluza–Klein theory extra dimensions, while the latter requires both to be true.
There is no experimental evidence to date that supports string theory's predictions of supersymmetry and Kaluza–Klein theory extra dimensions.
In a 2003 paper A dialog on quantum gravity, Carlo Rovelli regards the fact LQG is formulated in 4 dimensions and without supersymmetry as a strength of the theory as it represents the most parsimonious explanation, consistent with current experimental results, over its rival string/M-theory.
Peter Woit in Not Even Wrong and Lee Smolin in The Trouble with Physics also regards string/M-theory to be in conflict with current known experimental results.
Since LQG has been formulated in 4 dimensions (with and without supersymmetry), and M-theory requires supersymmetry and 11 dimensions, a direct comparison between the two has not been possible.
It is possible to extend mainstream LQG formalism to higher dimensional supergravity, general relativity with supersymmetry and Kaluza–Klein extradimensions should experimental evidence establish their existence.
It would therefore be desirable to have higher dimensional Supergravity loop quantizations at one'sdisposal in order to compare these approaches.
In fact a series of recent papers have been published attempting just this.
Most recently, Thiemann at el have made progress toward calculating black hole entropy for supergravity in higher dimensions.
It will be interesting to compare these results to the corresponding super string calculations.
As of April 2013 LHC has failed to find evidence of supersymmetry or Kaluza–Klein theory extra dimensions, which has encouraged LQG researchers.
Shaposhnikov in his paper "Is there a new physics between electroweak and Planck scales?"
has proposed the neutrino minimal standard model, which claims the most parsimonious theory is a standard model extended with neutrinos, plus gravity, and that extra dimensions, GUT physics, and supersymmetry, string/M-theory physics are unrealized in nature, and that any theory of quantum gravity must be four dimensional, like loop quantum gravity. 
Gravity has yet to be successfully included in a theory of everything.
Simply trying to combine the graviton with the strong and electroweak interactions runs into fundamental difficulties since the resulting theory is not renormalizable.
Theoretical physicists have not yet formulated a widely accepted, consistent theory that combines general relativity and quantum mechanics.
The incompatibility of the two theories remains an outstanding problem in the field of physics.
Some theoretical physicists currently believe that a quantum theory of general relativity may require frameworks other than field theory itself, such as string theory or loop quantum gravity.
Some models in string theory that are promising by way of realizing our familiar standard model are the perturbative heterotic string models, 11-dimensional M-theory, Singular geometries (e.g.
orbifold and orientifold), D-branes and other branes, flux compactification and warped geometry, non-perturbative type IIB superstring solutions (F-theory).