Cited by 82Quantum Mechanics and ApplicationsQuantum many-body systemsCold Atom Physics and Bose-Einstein Condensates

Long-time behavior of many-particle quantum decay

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del Campo, A.·2011·Physical Review A

Abstract

While exponential decay is ubiquitous in nature, deviations at both short and long times are dictated by quantum mechanics. Nonexponential decay is known to arise due to the possibility of reconstructing the initial state from the decaying products. We discuss the quantum decay dynamics by tunneling of a many-particle system, characterizing the long-time nonexponential behavior of the nonescape and survival probabilities. The effects of contact interactions and quantum statistics are described. It is found that, whereas for noninteracting bosons the long-time decay follows a power law with an exponent linear in the number of particles $N$, the exponent becomes quadratic in $N$ in the fermionic case. The same results apply to strongly interacting many-body systems related by the generalized Bose-Fermi duality. The faster fermionic decay can be traced back to the effective hard-core interactions between particles, which are as well the decaying products, and exhibit spatial antibunching which hinders the reconstruction of the initial unstable state. The results are illustrated with a paradigmatic model of quantum decay from a trap allowing leaks by tunneling, whose dynamics is described exactly by means of an expansion in resonant states.

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Authors
del Campo, A.
Venue
Physical Review A
Published
2011-07-22
Volume
84
Issue
1
ISSN
  • 0556-2791 (ISSN-L)
  • 1050-2947
  • 1094-1622
OpenAlex
W2118233490
Cited by
82
References
42
Citations by year
2026: 3 · 2025: 2 · 2024: 1 · 2023: 2 · 2022: 5 · 2021: 2 · 2020: 9 · 2019: 5 · 2018: 6 · 2017: 5 · 2016: 10 · 2015: 9 · 2014: 6 · 2013: 4 · 2012: 9
FWCI
3.99
Type
journal article
Language
en
Open access
Locations
  • Physical Review A (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum many-body systems
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Cold Atom Physics and Bose-Einstein Condensates
Keywords
quantum decay, non-exponential decay, long-time behavior, many-body systems, tunneling, survival probability, power-law decay, contact interaction, quantum statistics, bosons, fermions, hard-core interactions, resonant states

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