Measurements in QFT: Weakly coupled local particle detectors and entanglement harvesting

Grimmer, Daniel; Torres, Bruno de S. L.; Martín-Martínez, Eduardo

doi:10.1103/physrevd.104.085014

Cited by 20 publications

(24 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The stock answer to this question in the literature [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] is as follows. There are certain non-trivial mathematical differences between QFT and non-relativistic quantum theory which disallow us from directly transplanting our non-relativistic measurement theory into QFT.…”

Section: What Blocks Their Way Homementioning

confidence: 99%

“…III will answer this question. As a growing portion of the physics community is now becoming aware [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], the hand-wavy measurement models for QFT described in most textbooks on quantum field theory, quantum optics and particle physics are deeply unphysical and unsatisfying. Why is this so?…”

Section: Introduction: a Quantum Measurement Problemmentioning

confidence: 99%

“…It is often said [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] that the unphysical nature of these textbook measurement models can be traced to certain non-trivial mathematical differences between QFT and non-relativistic quantum theory (e.g., new causal and algebraic structures at play). These differences disallow us from directly transplanting our non-relativistic quantum measurement theory into QFT.…”

Section: Introduction: a Quantum Measurement Problemmentioning

confidence: 99%

“…However, in order to achieve a more wide-scoping measurement theory for QFT we need to identify some way of crossing the FT-cut which can be applied to our experimental setups nearuniversally. As I will discuss, our current best tool for getting a wide-scoping measurement theory for QFT is the Unruh-DeWitt detector model [13,[21][22][23][24][25][26][27][28][29][30][31][32][33], see [5].…”

Section: Introduction: a Quantum Measurement Problemmentioning

confidence: 99%

See 3 more Smart Citations

The Pragmatic QFT Measurement Problem and the need for a Heisenberg-like Cut in QFT

Grimmer¹

2022

Preprint

Self Cite

View full text Add to dashboard Cite

Section: What Blocks Their Way Homementioning

confidence: 99%

Section: Introduction: a Quantum Measurement Problemmentioning

confidence: 99%

Section: Introduction: a Quantum Measurement Problemmentioning

confidence: 99%

Section: Introduction: a Quantum Measurement Problemmentioning

confidence: 99%

See 2 more Smart Citations

The Pragmatic QFT Measurement Problem and the need for a Heisenberg-like Cut in QFT

Grimmer¹

2022

Preprint

Self Cite

View full text Add to dashboard Cite

“…There are several applications of these models, such as the study of the entanglement in quantum fields [15,[22][23][24][25][26], the Unruh effect [2,4,[27][28][29] and Hawking radiation [2,[30][31][32][33]. Moreover, particle detectors can be used to provide a measurement framework for quantum field theory [34,35], to probe the topology [36] and geometry of spacetime [9], among other applications [14,37,38].…”

Section: Introductionmentioning

confidence: 99%

Spacetime curvature from ultra rapid measurements of quantum fields

Perche,

Shalabi

2022

Preprint

View full text Add to dashboard Cite

We write the curvature of spacetime in terms of the excitation probability of particle detectors ultra-rapidly coupled to a quantum field. More precisely, we provide an expansion for the excitation probability of a smeared UDW detector delta-coupled to a real scalar quantum field in a curved background. Using a short distance expansion for the Wightman function, we express the excitation probability of a detector as the transition probability in Minkowski spacetime plus correction terms written as a function of the curvature tensors and the detector size. Comparing the excitation probability in curved spacetimes with its flat analog, we are able to express the components of the Ricci and Riemann curvature tensors as a function of physically measurable excitation probabilities of different shaped detectors.

show abstract

Entanglement structure of quantum fields through local probes

Torres

Wurtz

Polo-Gómez

et al. 2023

J. High Energ. Phys.

View full text Add to dashboard Cite

We present a framework to study the entanglement structure of a quantum field theory inspired by the formalism of particle detectors in relativistic quantum information. This framework can in principle be used to faithfully capture entanglement in a QFT between arbitrary-shaped regions of spacetime without encountering UV divergences, bypassing many of the issues typically present in other approaches. Our results also establish the limits of the efficiency of entanglement harvesting, and may also be used to motivate an operational definition of entanglement between spacetime subregions in field theory.

show abstract

Measurements in QFT: Weakly coupled local particle detectors and entanglement harvesting

Cited by 20 publications

References 49 publications

The Pragmatic QFT Measurement Problem and the need for a Heisenberg-like Cut in QFT

The Pragmatic QFT Measurement Problem and the need for a Heisenberg-like Cut in QFT

Spacetime curvature from ultra rapid measurements of quantum fields

Entanglement structure of quantum fields through local probes

Contact Info

Product

Resources

About