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PreprintCC BY-SA 4.0arXiv

Quantum-Enhanced Matterwave Interferometry in a Ring Waveguide

  • Sriganapathy Raghav
  • Utpal Roy
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Abstract

We propose a quantum-enhanced matter-wave interferometry protocol based on fractional-revival dynamics of a Bose-Einstein condensate in a ring, combined with a controlled interaction quench. Using the Truncated Wigner Approximation, we show that nonlinear evolution to the quarter revival generates modest spin squeezing of −2.03±0.28dB, which subsequently degrades under further nonlinear evolution. In contrast, starting from a non-interacting condensate, a controlled interaction quench applied after the initial quarter-revival beam-splitter operation generates substantially stronger spin squeezing of −14.57±0.27dB. We further show that phase control at t=3Tr/8 rotates the squeezed quadrature onto the phase-sensitive direction Ĵy, producing a phase-squeezed state at t=Tr/2. The subsequent quarter-revival evolution converts this phase-squeezed state into a number-squeezed state, enabling population-difference readout. The resulting sequence provides a route to quantum-enhanced interferometry using the intrinsic fractional-revival dynamics of a ring together with controlled interaction and phase operations.

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Cite

BibTeXRIS
BibTeX
@misc{raghav2026quantumenhanced,
  title = {{Quantum-Enhanced Matterwave Interferometry in a Ring Waveguide}},
  author = {Sriganapathy Raghav and Utpal Roy},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29562},
  eprint = {2610.29562},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29562},
  note = {CC BY-SA 4.0},
}
RIS
TY  - UNPB
TI  - Quantum-Enhanced Matterwave Interferometry in a Ring Waveguide
AU  - Sriganapathy Raghav
AU  - Utpal Roy
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2610.29562
UR  - https://arxiv.org/abs/2610.29562
AB  - We propose a quantum-enhanced matter-wave interferometry protocol based on fractional-revival dynamics of a Bose-Einstein condensate in a ring, combined with a controlled interaction quench. Using the Truncated Wigner Approximation, we show that nonlinear evolution to the quarter revival generates modest spin squeezing of −2.03±0.28dB, which subsequently degrades under further nonlinear evolution. In contrast, starting from a non-interacting condensate, a controlled interaction quench applied after the initial quarter-revival beam-splitter operation generates substantially stronger spin squeezing of −14.57±0.27dB. We further show that phase control at t=3T_r/8 rotates the squeezed quadrature onto the phase-sensitive direction Ĵ_y, producing a phase-squeezed state at t=T_r/2. The subsequent quarter-revival evolution converts this phase-squeezed state into a number-squeezed state, enabling population-difference readout. The resulting sequence provides a route to quantum-enhanced interferometry using the intrinsic fractional-revival dynamics of a ring together with controlled interaction and phase operations.
ER  -