Accessible and inaccessible quantum coherence in relativistic quantum systems

Harikrishnan, Saveetha; Jambulingam, Segar; Rohde, Peter P.; Radhakrishnan, Chandrashekar

doi:10.1103/physreva.105.052403

Cited by 16 publications

(19 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other words, quantum coherence has the opposite behavior compared with the quantum correlation (entanglement and discord) for the two field modes in de Sitter space [48,49]. Our result also reveals the difference of the de Sitter space with the Rindler or black hole spacetimes; in the latter two spacetimes quantum coherence decreases monotonically with the strengthening of Unruh effect [32,33] or Hawking effect [46].…”

Section: Introductionmentioning

confidence: 73%

“…Note that, in Rindler spacetime, both quantum correlation and coherence decrease monotonically with the increase of acceleration [25][26][27][28][29][30][31][32][33][34][35][36][37][38]. This means that the Unruh effect and the curvature effect of de Sitter space play similar roles to quantum correlation (destroy quantum correlation), but play different roles to quantum coherence (Unruh effect destroys, while the curvature effect of de Sitter space improves quantum coherence).…”

Section: Quantum Coherence In De Sitter Spacementioning

confidence: 95%

“…Unfortunately, we can present the discussion only based on the l 1 -norm of coherence, because of its simplicity. The Minkowski vacuum and excitation states observed by an inertial observer relate to the states of I and II regions in Rindler spacetime as follows [25,32]…”

Section: Quantum Coherence In De Sitter Spacementioning

confidence: 99%

“…The important predictions in QFT are the Unruh effect, the Hawking radiation, and the generation of entanglement entropy in an expanding universe and de Sitter space, which tells us that the vacuum of the field depends on the observer [20][21][22][23][24]. It has been found that (i) quantum entanglement, discord, and coherence decrease monotonically with the increase of acceleration in Rindler spacetime [25][26][27][28][29][30][31][32][33][34][35][36][37][38];…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Would quantum coherence be increased by curvature effect in de Sitter space?

Wu¹,

Wang²,

Liu³

et al. 2022

Preprint

View full text Add to dashboard Cite

We study the quantum coherence in de Sitter space for the bipartite system of Alice and Bob who initially share an entangled state between the two modes of a free massive scalar field. It is shown that the space-curvature effect can produce both local coherence and correlated coherence, leading to the increase of the total coherence of the bipartite system. These results are sharp different from the Unruh effect or Hawking effect, which, in the single mode approximation, cannot produce local coherence and at the same time destroy correlated coherence, leading to the decrease of the total coherence of the bipartite systems.Interestingly, we find that quantum coherence has the opposite behavior compared with the quantum correlation in de Sitter space. We also find that quantum coherence is most severely affected by the curvature effect of de Sitter space for the cases of conformal invariance and masslessness. Our result reveals the difference between the curvature effect in the de Sitter space and the Unruh effect in Rindler spacetime or the Hawking effect in black hole spacetime on quantum coherence.

show abstract

Section: Introductionmentioning

confidence: 73%

Section: Quantum Coherence In De Sitter Spacementioning

confidence: 95%

Section: Quantum Coherence In De Sitter Spacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Would quantum coherence be increased by curvature effect in de Sitter space?

Wu¹,

Wang²,

Liu³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In this report we will examine the ability of a massive quantum field to generate or destroy coherence in a two-level Unruh-DeWitt (UDW) detector under an instantaneous interaction [41][42][43][44][45][46][47] (for a study of the coherence present in the field under a different context see [48][49][50][51]). To accomplish this we will determine the cohering and decohering power of the quantum evolution channel induced by the action of the field on the detector [52][53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Cohering and decohering power of massive scalar fields under instantaneous interactions

Kollas¹,

Moustos²,

Muñoz³

2022

Preprint

View full text Add to dashboard Cite

Employing a non-perturbative approach based on an instantaneous interaction between a twolevel Unruh-DeWitt detector and a massive scalar field, we investigate the ability of the field to generate or destroy coherence in the detector by deriving the cohering and decohering power of the induced quantum evolution channel. For a field in a coherent state a previously unnoticed effect is reported whereby the amount of coherence that the field generates displays a revival pattern with respect to the size of the detector. It is demonstrated that by including mass in a thermal field the set of maximally coherent states of the detector decoheres less compared to a zero mass. In both of the examples mentioned, by making a suitable choice of detector radius, field energy and coupling strength it is possible to infer the mass of the field by either measuring the coherence present in the detector in the case of an interaction with a coherent field or the corresponding decoherence of a maximally coherent state in the case of a thermal field. In view of recent advances in the study of Proca metamaterials, these results suggest the possibility of utilising the theory of massive electromagnetism for the construction of novel applications for use in quantum technologies.

show abstract

Would quantum coherence be increased by curvature effect in de Sitter space?

Wang

Liu

et al. 2023

J. High Energ. Phys.

View full text Add to dashboard Cite

We study the quantum coherence in de Sitter space for the bipartite system of Alice and Bob who initially share an entangled state between the two modes of a free massive scalar field. It is shown that the space-curvature effect can produce both local coherence and correlated coherence, leading to the increase of the total coherence of the bipartite system. These results are sharp different from the Unruh effect or Hawking effect, which, in the single mode approximation, cannot produce local coherence and at the same time destroy correlated coherence, leading to the decrease of the total coherence of the bipartite systems. Interestingly, we find that quantum coherence has the opposite behavior compared with the quantum correlation in de Sitter space. We also find that quantum coherence is most severely affected by the curvature effect of de Sitter space for the cases of conformal invariance and masslessness. Our result reveals the difference between the curvature effect in the de Sitter space and the Unruh effect in Rindler spacetime or the Hawking effect in black hole spacetime on quantum coherence.

show abstract

Accessible and inaccessible quantum coherence in relativistic quantum systems

Cited by 16 publications

References 81 publications

Would quantum coherence be increased by curvature effect in de Sitter space?

Would quantum coherence be increased by curvature effect in de Sitter space?

Cohering and decohering power of massive scalar fields under instantaneous interactions

Would quantum coherence be increased by curvature effect in de Sitter space?

Contact Info

Product

Resources

About