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3286 results in Quantum Physics, Quantum Information and Quantum Computation

Page 58 of 165

  • 1 - Introduction

  • Peter P. Rohde, University of Technology, Sydney
  • Book:
    The Quantum Internet
    Published online:
    09 September 2021
    Print publication:
    30 September 2021, pp 1-6
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The Quantum Internet
  • The Second Quantum Revolution
  • Peter P. Rohde
  • Published online:
    09 September 2021
    Print publication:
    30 September 2021
  • Following the emergence of quantum computing, the subsequent quantum revolution will be that of interconnecting individual quantum computers at the global level. In the same way that classical computers only realised their full potential with the emergence of the internet, a fully-realised quantum internet is the next stage of evolution for quantum computation. This cutting-edge book examines in detail how the quantum internet would evolve in practise, focusing not only on the technology itself, but also the implications it will have economically and politically, with numerous non-technical sections throughout the text providing broader context to the discussion. The book begins with a description of classical networks before introducing the key concepts behind quantum networks, such as quantum internet protocols, quantum cryptography, and cloud quantum computing. Written in an engaging style and accessible to graduate students in physics, engineering, computer science and mathematics.

  • 7 - Atom Interferometry

  • Tim Byrnes, Ebubechukwu O. Ilo-Okeke
  • Book:
    Quantum Atom Optics
    Published online:
    23 July 2021
    Print publication:
    05 August 2021, pp 115-129

  • Summary

    This chapter describes the Bose--Einstein condensate (BEC) interferometry. We first introduce the optical interferometer, briefly discussing the role of fringe contrast in observing interference patterns. Next, we examine a BEC interferometer in a Michelson geometry that consists of a BEC in a trapping potential well. The BEC cloud in the potential well is put into a linear superposition of two clouds that travel along different paths in the trap and are recombined using the same light beams. By studying the population of atoms in the different motional states of the BEC clouds that emergeafter recombination, we obtain information about the relative phase shift accumulated by the two traveling superposed condensates during the interferometry. We then characterize the atom distribution that is found in the output of the interferometer by finding the probability density distribution and calculating the features of the probability density such as the mean, the variance, and the interference fringe contrast. Finally, we parameterize the effect of two-body collisional interactions on the observed interference fringes in a way that can be directly controlled in an experiment.

  • 1 - Quantum Many-Body Systems

  • Tim Byrnes, Ebubechukwu O. Ilo-Okeke
  • Book:
    Quantum Atom Optics
    Published online:
    23 July 2021
    Print publication:
    05 August 2021, pp 1-9
    • Chapter
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  • Summary

    This chapter introduces the basic theoretical tools for handling many-body quantum systems. Starting from second quantized operators, we discuss how it is possible to describe the composite wavefunction of multi-particle systems, and discuss representations in various bases. The algebra of Fock states is described for single and multi-mode systems, and how they relate to the eigenstates of the Schrodinger equation. Finally, we describe how interactions between particles can be introduced in a general way, and then describe the most common type of interaction in cold atom systems, the s-wave interaction

  • 4 - Spin Dynamics of Atoms

  • Tim Byrnes, Ebubechukwu O. Ilo-Okeke
  • Book:
    Quantum Atom Optics
    Published online:
    23 July 2021
    Print publication:
    05 August 2021, pp 44-63

  • Summary

    This chapter discusses the spin degrees of freedom in an atom. We first review how atomic energy levels can be classified in terms of the electron spin and orbital angular momenta and how this couples to the nuclear spin. We then describe how atoms interact with each other, and how the spins affect this interaction. The effect of electromagnetic radiation on the energy levels of an atom is described, and the Hamiltonian for energy levels transitions . After briefly describing how the important phenomena of the ac Stark shift and Feshbach resonances occur, we then turn to describing how dissipative dynamics affect atomic systems. Specifically, we examine master equations for spontaneous emission and atom loss, and look at these can be solved. Finally, we consider an alternative framework for solving such open systems using the quantum jump method, which allows for a stochastic approach to solving the dynamics

Page 58 of 165