The Philosophy behind Quantum Gravity
... theory). Also, and more explicitly in the quote, the idea is reconstructing the universe from scratch. That is, if we have the universal laws described by a fundamental theory, and we have identified the fundamental constituents of matter, then we can derive –at least in principle –all phenomena in ...
... theory). Also, and more explicitly in the quote, the idea is reconstructing the universe from scratch. That is, if we have the universal laws described by a fundamental theory, and we have identified the fundamental constituents of matter, then we can derive –at least in principle –all phenomena in ...
Quantum violation of classical physics in macroscopic systems
... macroscopic everyday world. While microscopic particles, such as photons, electrons or even large molecules, can nowadays be put into superposition or entangled states [17–19], the concept that a macroscopic object, such as a cat, could be in a superposition state, seems, in Schrödinger’s words, bur ...
... macroscopic everyday world. While microscopic particles, such as photons, electrons or even large molecules, can nowadays be put into superposition or entangled states [17–19], the concept that a macroscopic object, such as a cat, could be in a superposition state, seems, in Schrödinger’s words, bur ...
Direct Characterization of Quantum Dynamics: General Theory
... However, they are insufficient for performing arbitrary quantum operations [1]. Similarly to the case of a qubit [25], the DCQD algorithm for the case of a qudit system consists of two procedures: (i) a single experimental configuration for characterization of the quantum dynamical populations, and ...
... However, they are insufficient for performing arbitrary quantum operations [1]. Similarly to the case of a qubit [25], the DCQD algorithm for the case of a qudit system consists of two procedures: (i) a single experimental configuration for characterization of the quantum dynamical populations, and ...
12 Quantum Electrodynamics
... In this chapter we want to couple electrons and photons with each other by an appropriate interaction and study the resulting interacting field theory, the famous quantum electrodynamics (QED). Since the coupling should not change the two physical degrees of freedom described by the four-component p ...
... In this chapter we want to couple electrons and photons with each other by an appropriate interaction and study the resulting interacting field theory, the famous quantum electrodynamics (QED). Since the coupling should not change the two physical degrees of freedom described by the four-component p ...
Cooling and Trapping Neutral Atoms
... 2. Parametric scattering of Bose-Einstein condensates in a one dimensional optical lattice If a condensate with positive scattering length is moving in free space, the condensate is stable: Atoms cannot elastically scatter into different momentum states and conserve energy and momentum due to the qu ...
... 2. Parametric scattering of Bose-Einstein condensates in a one dimensional optical lattice If a condensate with positive scattering length is moving in free space, the condensate is stable: Atoms cannot elastically scatter into different momentum states and conserve energy and momentum due to the qu ...
Theoretische und Mathematische Grundlagen der Physik
... — •Ivo Knittel and Uwe Hartmann — Institute of experimental physics, University of Saarbrücken, 66041 Saarbrücken The decoherence rate of a quantum particle can be much higher than the rate of momentum change. An example is a free particle moving with a constant velocity in a dephasing environment ...
... — •Ivo Knittel and Uwe Hartmann — Institute of experimental physics, University of Saarbrücken, 66041 Saarbrücken The decoherence rate of a quantum particle can be much higher than the rate of momentum change. An example is a free particle moving with a constant velocity in a dephasing environment ...
Quantum teleportation
Quantum teleportation is a process by which quantum information (e.g. the exact state of an atom or photon) can be transmitted (exactly, in principle) from one location to another, with the help of classical communication and previously shared quantum entanglement between the sending and receiving location. Because it depends on classical communication, which can proceed no faster than the speed of light, it cannot be used for faster-than-light transport or communication of classical bits. It also cannot be used to make copies of a system, as this violates the no-cloning theorem. While it has proven possible to teleport one or more qubits of information between two (entangled) atoms, this has not yet been achieved between molecules or anything larger.Although the name is inspired by the teleportation commonly used in fiction, there is no relationship outside the name, because quantum teleportation concerns only the transfer of information. Quantum teleportation is not a form of transportation, but of communication; it provides a way of transporting a qubit from one location to another, without having to move a physical particle along with it.The seminal paper first expounding the idea was published by C. H. Bennett, G. Brassard, C. Crépeau, R. Jozsa, A. Peres and W. K. Wootters in 1993. Since then, quantum teleportation was first realized with single photons and later demonstrated with various material systems such as atoms, ions, electrons and superconducting circuits. The record distance for quantum teleportation is 143 km (89 mi).