© 2018

Quantum‐Enhanced Sensing Based on Time Reversal of Entangling Interactions


Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xviii
  2. Daniel Linnemann
    Pages 1-22
  3. Theoretical Basics

    1. Front Matter
      Pages 23-23
    2. Daniel Linnemann
      Pages 25-30
  4. Concepts of Time Reversal Interferometry

    1. Front Matter
      Pages 51-51
    2. Daniel Linnemann
      Pages 53-65
  5. Experimental Platform

    1. Front Matter
      Pages 75-75
  6. Experimental Results

    1. Front Matter
      Pages 91-91
    2. Daniel Linnemann
      Pages 93-105
    3. Daniel Linnemann
      Pages 107-126
    4. Daniel Linnemann
      Pages 127-133
    5. Daniel Linnemann
      Pages 135-142
    6. Daniel Linnemann
      Pages 143-150
  7. Back Matter
    Pages 151-165

About this book


Quantum mechanics entails effects like superpositions and entanglement, which have no classical counterparts. From a technological standpoint these counterintuitive quantum aspects can be viewed as an unexploited resource that can be harnessed to support various tasks, e.g. in the domains of computation, communication, and metrology.

In many applications, however, the potential of nonclassical states cannot practically be exploited due to detection inefficiencies. The authors address this limitation by experimentally realizing a novel detection scheme in which entangling interactions are time reversed. In this way, nonclassical many-particle states are disentangled, allowing them to be detected in a robust and technically feasible manner. In the context of quantum metrology, these nonlinear readout techniques extend the class of entangled probe states that can be leveraged for sensing applications without being limited by finite detector resolution.

The authors present an active atom interferometer, where both the entangled state preparation and disentangling readout involve parametric amplification. This “SU(1,1)” interferometer is implemented with the help of spinor Bose–Einstein condensates, where amplification is implemented by atomic collisions leading to spin exchange.


Quantum Metrology Quantum-Enhanced Interferometry Atom Interferometry Active Atom Interferometry Harnessing entanglement Time Reversal of Entangling Interactions Interaction-Based Readout Nonlinear Readout Time Reversal Interferometry with Amplifiers

Authors and affiliations

  1. 1.Kirchhoff-Institut für PhysikUniversität HeidelbergHeidelbergGermany

Bibliographic information

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