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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Integrated Mach-Zehnder interferometer for Bose-Einstein condensates.

T Berrada1, S van Frank, R Bücker

  • 1Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria.

Nature Communications
|June 28, 2013
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Summary
This summary is machine-generated.

Researchers created a full Mach-Zehnder interferometer using Bose-Einstein condensates on an atom chip. This quantum-enhanced matter-wave sensor shows potential for advanced precision measurements.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Metrology

Background:

  • Particle-wave duality is key for matter-wave interferometers, complementing optical ones in precision measurements.
  • Developing integrated atom-optics elements (beam splitters, phase shifters, recombiners) for matter-wave interferometers is crucial.
  • Previous efforts faced challenges in integrating all necessary components into a single device.

Purpose of the Study:

  • To demonstrate a complete Mach-Zehnder interferometer sequence using trapped Bose-Einstein condensates (BECs) on an atom chip.
  • To exploit particle interactions in BECs to generate non-classical states for enhanced sensing.
  • To investigate the potential of entanglement as a resource for metrology using matter waves.

Main Methods:

  • Utilized trapped Bose-Einstein condensates confined on an atom chip.
  • Implemented a full Mach-Zehnder interferometer sequence with atom-optics analogues.
  • Exploited nonlinear interactions within the BEC matter waves to create non-classical states with reduced number fluctuations.
  • Applied controlled phase shifts using spatially separated wave packets and read out using a non-adiabatic matter-wave recombiner.

Main Results:

  • Successfully demonstrated a full Mach-Zehnder sequence with trapped BECs on an atom chip.
  • Generated a non-classical state with reduced number fluctuations by exploiting BEC nonlinearity.
  • Achieved coherence times three times longer than expected for coherent states.
  • Showcased the use of entanglement as a metrological resource.

Conclusions:

  • The integrated atom chip device successfully performed a Mach-Zehnder sequence with BECs.
  • Exploiting nonlinearity in BECs enables the generation of non-classical states for enhanced interferometry.
  • The demonstrated coherence times highlight the significant potential of entanglement in matter-wave metrology.
  • These findings pave the way for developing integrated quantum-enhanced matter-wave sensors.