Quantum Temporal Superposition: the case of QFT
- URL: http://arxiv.org/abs/2002.06208v2
- Date: Wed, 2 Dec 2020 14:14:22 GMT
- Title: Quantum Temporal Superposition: the case of QFT
- Authors: Laura J. Henderson, Alessio Belenchia, Esteban Castro-Ruiz, Costantino
Budroni, Magdalena Zych, \v{C}aslav Brukner and Robert B. Mann
- Abstract summary: We consider what happens when a quantum-controlled superposition of detectors at different space-time points is used to probe the correlations of the field.
We show that, due to quantum interference effects, two detectors can gain information on field correlations which would not be otherwise accessible.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum field theory is completely characterized by the field correlations
between spacetime points. In turn, some of these can be accessed by locally
coupling to the field simple quantum systems, a.k.a. particle detectors. In
this work, we consider what happens when a quantum-controlled superposition of
detectors at different space-time points is used to probe the correlations of
the field. We show that, due to quantum interference effects, two detectors can
gain information on field correlations which would not be otherwise accessible.
This has relevant consequences for information theoretic quantities, like
entanglement and mutual information harvested from the field. In particular,
the quantum control allows for extraction of entanglement in scenarios where
this is otherwise provably impossible.
Related papers
- Particle detectors in superposition in de Sitter spacetime [0.0]
Cosmological particle creation is the phenomenon by which the expansion of spacetime results in the production of particles of a given quantum field in that spacetime.
We study this phenomenon by considering a multi-level quantum particle detector in de Sitter spacetime coupled to a massless real quantum scalar field.
The main novel result is that, due to the quantum nature of the superposition of trajectories, the state of the detector after interaction with the field is not only a mixture of the thermal states that would be expected from each individual static trajectory but rather exhibits additional coherences due to interferences between the different trajectories.
arXiv Detail & Related papers (2024-03-04T14:45:33Z) - Quantitative bounds to propagation of quantum correlations in many-body
systems [0.0]
We establish limits to bipartite quantum correlations in many-body systems.
Results confirm that proliferation of classical information in the Universe suppresses quantum correlations.
arXiv Detail & Related papers (2023-10-04T00:24:06Z) - Bound state of distant photons in waveguide quantum electrodynamics [137.6408511310322]
Quantum correlations between distant particles remain enigmatic since the birth of quantum mechanics.
We predict a novel kind of bound quantum state in the simplest one-dimensional setup of two interacting particles in a box.
Such states could be realized in the waveguide quantum electrodynamics platform.
arXiv Detail & Related papers (2023-03-17T09:27:02Z) - Bell inequalities with overlapping measurements [52.81011822909395]
We study Bell inequalities where measurements of different parties can have overlap.
This allows to accommodate problems in quantum information.
The scenarios considered show an interesting behaviour with respect to Hilbert space dimension, overlap, and symmetry.
arXiv Detail & Related papers (2023-03-03T18:11:05Z) - Space-time dual quantum Zeno effect: Interferometric engineering of open
quantum system dynamics [0.0]
We show that the superposition of multiple trajectories can result in quantum state freezing.
Non-trivial Dicke-like super(sub)radiance can be triggered without utilizing multi-atom correlations.
arXiv Detail & Related papers (2022-08-04T05:49:53Z) - Efficient Bipartite Entanglement Detection Scheme with a Quantum
Adversarial Solver [89.80359585967642]
Proposal reformulates the bipartite entanglement detection as a two-player zero-sum game completed by parameterized quantum circuits.
We experimentally implement our protocol on a linear optical network and exhibit its effectiveness to accomplish the bipartite entanglement detection for 5-qubit quantum pure states and 2-qubit quantum mixed states.
arXiv Detail & Related papers (2022-03-15T09:46:45Z) - New results on vacuum fluctuations: Accelerated detector versus inertial
detector in a quantum field [0.0]
We focus on two moving detectors system for future application in quantum teleportation.
We find that the rajectory of a uniformly accelerated detector in Rindler space cannot be extended to a trajectory in which a detector moves at constant velocity.
arXiv Detail & Related papers (2021-04-07T17:06:33Z) - Exchange-Mediated Mutual Correlation and Dephasing in Free-Electron and
Light Interactions [0.0]
Correlations between quantum particles such as entanglement can be exploited to speed up computational algorithms or enable secure cryptography.
We will show that the exchange term has a substantial role in transferring the information between two mutually spin-correlated electrons.
Our findings might facilitate fermionic matter-wave interferometry experiments.
arXiv Detail & Related papers (2021-02-15T10:23:34Z) - Information Scrambling in Computationally Complex Quantum Circuits [56.22772134614514]
We experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor.
We show that while operator spreading is captured by an efficient classical model, operator entanglement requires exponentially scaled computational resources to simulate.
arXiv Detail & Related papers (2021-01-21T22:18:49Z) - Quantum information spreading in a disordered quantum walk [50.591267188664666]
We design a quantum probing protocol using Quantum Walks to investigate the Quantum Information spreading pattern.
We focus on the coherent static and dynamic disorder to investigate anomalous and classical transport.
Our results show that a Quantum Walk can be considered as a readout device of information about defects and perturbations occurring in complex networks.
arXiv Detail & Related papers (2020-10-20T20:03:19Z) - Jumptime unraveling of Markovian open quantum systems [68.8204255655161]
We introduce jumptime unraveling as a distinct description of open quantum systems.
quantum jump trajectories emerge, physically, from continuous quantum measurements.
We demonstrate that quantum trajectories can also be ensemble-averaged at specific jump counts.
arXiv Detail & Related papers (2020-01-24T09:35:32Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.