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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Quantum superposition at the half-metre scale.

T Kovachy1, P Asenbaum1, C Overstreet1

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA.

Nature
|December 25, 2015
PubMed
Summary
This summary is machine-generated.

Quantum superposition is demonstrated for massive particles over unprecedented macroscopic distances and timescales. This research extends quantum mechanics into everyday life, paving the way for advanced gravitational measurements.

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Area of Science:

  • Quantum Mechanics
  • Atomic Physics
  • Macroscopic Quantum Phenomena

Background:

  • Quantum superposition allows particle delocalization, challenging classical intuition at macroscopic scales.
  • Matter-wave interferometry probes superposition but faces limitations in wave-packet separation due to decoherence.
  • Schrödinger's cat thought experiment highlights the counterintuitive nature of macroscopic superposition.

Purpose of the Study:

  • To experimentally probe the quantum superposition principle at macroscopic scales.
  • To overcome limitations in wave-packet separation for atom interferometry.
  • To explore the transition from quantum to classical physics.

Main Methods:

  • Utilized light-pulse atom interferometry with sub-nanokelvin atom temperatures.
  • Achieved large wave-packet separation (up to 54 cm) on a 1-second timescale.
  • Compensated transverse optical forces to maintain interference contrast.

Main Results:

  • Demonstrated quantum interference with wave packets separated by 54 cm.
  • Maintained a significant interference contrast of 28% at macroscopic scales.
  • Extended the regime of quantum superposition to everyday distances and timescales.

Conclusions:

  • Quantum superposition is achievable in a new macroscopic regime, bridging quantum mechanics and classical reality.
  • Large quantum superposition states are crucial for enhanced atom interferometry applications.
  • Future applications include improved tests of the equivalence principle and gravitational wave detection.