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The capacity of the noisy quantum channel
The capacity of the noisy quantum channel

... taken on its own is described by a density matrix ρin . Now send the first variable down the channel. The result is a partially entangled state for the two variables described by density matrix ρᾱ . That is, Sᾱ is the entropy increase when one of two fully entangled variables is sent down the cha ...
Dynamics of the quantum Duffing oscillator in the driving induced q
Dynamics of the quantum Duffing oscillator in the driving induced q

Functorial Field Theories and Factorization Algebras
Functorial Field Theories and Factorization Algebras

... According to the main result of the Lagrangian formulation of classical mechanics, solutions of Newton’s differential equation (2.2) correspond essentially to critical points of the action functional S. However, we need boundary conditions to obtain the correct statement (without them, the functiona ...
Quantum neural networks
Quantum neural networks

... • Many universes (many-world) interpretation of Everett [6], etc. The choice of interpretation is important in establishing different analogies between quantum physics and neurocomputing. The field of neural networks contains several important basic ideas, which include the concept of a processing e ...
Medical Statistics - Programme Specifications
Medical Statistics - Programme Specifications

Heisenberg`s original derivation of the uncertainty principle and its
Heisenberg`s original derivation of the uncertainty principle and its

... class of measurements and does not generally characterize the state changes caused by quantum measurements. In fact, there exist commonly used measurements of discrete observables, such as photon counting, that do not satisfy the repeatability hypothesis15. Moreover, it has been shown that the repea ...
Quantum Teleportation
Quantum Teleportation

Quantum Rotations: A Case Study in Static and Dynamic Machine
Quantum Rotations: A Case Study in Static and Dynamic Machine

A Quantum-mechanical Model of Histone Modification in Gene
A Quantum-mechanical Model of Histone Modification in Gene

... groups or one acetate group, etc) bound to the modified residues the torsion angles { θ } of histone chain between Xa and Xr (possibly including torsion angles on the nearby histone modifying enzymes) participate in the quantum transition cooperatively. The dynamical variables of the system are deno ...
Optimal quantum cloning of orbital angular momentum photon
Optimal quantum cloning of orbital angular momentum photon

... The overall transferrer fidelity within the output OAM subspace is estimated at Fprep = (0.96 ± 0.01), mainly due to the imperfect mode quality of the q-plates, leading to a non-perfect π → o2 conversion. The polarization and temporal matching on the beam splitter between photons on mode a and b has ...
Landau Levels in Graphene - Department of Theoretical Physics
Landau Levels in Graphene - Department of Theoretical Physics

... be eigenfunction of X1 and X2 at the same time. Therefore the center of the orbit cannot be determined with arbitrary precision even in principle. Classical circular orbits can be (to certain precision) obtained only as a wave packet from the wavefunctions corresponding to different Landau levels. S ...
REDUCED AND EXTENDED WEAK COUPLING LIMIT
REDUCED AND EXTENDED WEAK COUPLING LIMIT

IOSR Journal of Applied Physics (IOSR-JAP)
IOSR Journal of Applied Physics (IOSR-JAP)

... use of fig. (4) to determine the negative differential resistance regions, which takes the following role for . Notably, the position of with respect to the energy reference (E=0) and the magnetic field effect both are important to determine the values of spin bias at which the device acts as resist ...
Entanglement and Quantum Teleportation
Entanglement and Quantum Teleportation

CHAPTER 5 Mass Spectrometry
CHAPTER 5 Mass Spectrometry

... a mass filter. The common components of a modern ICP-MS are shown in Figure 5.1 (the sampling interface is not shown). The torch and the plasma were discussed in Section 4.3.3 (Animations 4.1 and 4.2). For MS systems, the detector is axially aligned with the plasma to follow the flow trajectory of t ...
The stuff the world is made of: physics and reality
The stuff the world is made of: physics and reality

... In the picture that we now want to propose for quantum entities the situation is very different. We assume that the experiment in which the quantum entity is detected contains a creation-element: this actually in part creates a place for the entity, at the moment when the detection is carried out. ...
Document
Document

... A combination of precise low-energy measurements, high energy collider experiments, dark matter searches, and theoretical advances will help us determine if new symmetries at the electroweak scale can account for the abundance of matter ...
Wigner functions - Statistical Physics and Theory of Chaos
Wigner functions - Statistical Physics and Theory of Chaos

... space. The quantity 兩␸共p兲兩2 gives the probability density in the momentum variable. Although straightforward, the momentum distribution is difficult to visualize if one only has ␺共x兲. It would be desirable to have a function that displays the probability distribution simultaneously in the x and p va ...
Random Repeated Interaction Quantum Systems
Random Repeated Interaction Quantum Systems

Discrete Symmetries
Discrete Symmetries

Questions from past exam papers. 1. (a) (8 marks) The Hamiltonian
Questions from past exam papers. 1. (a) (8 marks) The Hamiltonian

Lecture 18 — October 26, 2015 1 Overview 2 Quantum Entropy
Lecture 18 — October 26, 2015 1 Overview 2 Quantum Entropy

Theory of Brain Function, Quantum Mechanics and Superstrings
Theory of Brain Function, Quantum Mechanics and Superstrings

... Theory of brain function, quantum mechanics, and superstrings are three fascinating topics, which at first look bear little, if any at all, relation to each other. Trying to put them together in a cohesive way, as described in this task, becomes a most demanding challenge and unique experience. The ...
Introduction to Quantum Computation
Introduction to Quantum Computation

Topological order at finite temperature?
Topological order at finite temperature?

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Scalar field theory

In theoretical physics, scalar field theory can refer to a classical or quantum theory of scalar fields. A scalar field is invariant under any Lorentz transformation.The only fundamental scalar quantum field that has been observed in nature is the Higgs field. However, scalar quantum fields feature in the effective field theory descriptions of many physical phenomena. An example is the pion, which is actually a pseudoscalar.Since they do not involve polarization complications, scalar fields are often the easiest to appreciate second quantization through. For this reason, scalar field theories are often used for purposes of introduction of novel concepts and techniques.The signature of the metric employed below is (+, −, −, −).
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