Journal
PHYSICAL REVIEW A
Volume 82, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.82.042332
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Funding
- EPSRC [EP/G00496X/2]
- STFC (UK) [PP/D507358/1]
- CSIC [JAE-PREDOC2007]
- Spanish MICINN [FIS2008-05705/FIS]
- Engineering and Physical Sciences Research Council [EP/G00496X/2, EP/G00496X/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/G000417/1] Funding Source: researchfish
- EPSRC [EP/G00496X/1, EP/G00496X/2] Funding Source: UKRI
- STFC [ST/G000417/1] Funding Source: UKRI
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We address the validity of the single-mode approximation that is commonly invoked in the analysis of entanglement in noninertial frames and in other relativistic quantum-information scenarios. We show that the single-mode approximation is not valid for arbitrary states, finding corrections to previous studies beyond such approximations in the bosonic and fermionic cases. We also exhibit a class of wave packets for which the single-mode approximation is justified subject to the peaking constraints set by an appropriate Fourier transform.
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