Multiple measurements on an uncollapsed entangled two-photon state
- URL: http://arxiv.org/abs/2210.06045v2
- Date: Tue, 6 Feb 2024 14:12:27 GMT
- Title: Multiple measurements on an uncollapsed entangled two-photon state
- Authors: Dalibor Jav\r{u}rek
- Abstract summary: I derive conditions, under which two measurements can be taken on the uncollapsed photon-pair state.
The measurements taken by both detectors in this situation are uncorrelated.
If experimental results of the proposed experiment disagree with the predictions -- results measured on the quantum state are correlated, new space-time distribution of the quantum state's collapse has to be proposed.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The relativity of simultaneity together with definition of a quantum state's
collapse result into experimental situations, where a multiple measurements can
be taken on an uncollapsed quantum state. A quantum state's collapse space-time
distribution is shown in a reference frame of a detector measuring the quantum
system and in a reference frame moving relative to the detector. From their
inspection follows, that under certain conditions, multiple measurements are
allowed on the same uncollapsed quantum state. An application of the developed
approach is shown on measurement of photon-pair state entangled in
polarizations and energy. I derive conditions, under which two measurements can
be taken on the uncollapsed photon-pair state. From allowance of multiple
measurements on the same uncollapsed state follow serious consequences. For
example, the measurements taken by both detectors in this situation are
uncorrelated. Moreover, all the conservation laws could be violated in
individual measurements, but not in mean value. This statement is proved on the
two-photon state entangled in energy. This is in contradiction with
experimental results observed by the detectors in rest relative to each other.
If experimental results of the proposed experiment disagree with the
predictions -- results measured on the quantum state are correlated, new
space-time distribution of the quantum state's collapse, different from the
Copenhagen interpretation, has to be proposed for proper solution of this
situation.
Related papers
- Measuring the Evolution of Entanglement in Compton Scattering [101.11630543545151]
The behavior of quantum entanglement during scattering is identical to the behavior of initially classically correlated photons up to a constant factor equal to two.
Our dedicated experiment with photons confirms these results and explains the "Puzzle of Decoherence" observed recently.
arXiv Detail & Related papers (2024-06-20T14:21:23Z) - Observation of partial and infinite-temperature thermalization induced
by repeated measurements on a quantum hardware [62.997667081978825]
We observe partial and infinite-temperature thermalization on a quantum superconducting processor.
We show that the convergence does not tend to a completely mixed (infinite-temperature) state, but to a block-diagonal state in the observable basis.
arXiv Detail & Related papers (2022-11-14T15:18:11Z) - Entanglement of annihilation photons [141.5628276096321]
We present the results of a new experimental study of the quantum entanglement of photon pairs produced in positron-electron annihilation at rest.
Despite numerous measurements, there is still no experimental proof of the entanglement of photons.
arXiv Detail & Related papers (2022-10-14T08:21:55Z) - Experimental demonstration of optimal unambiguous two-out-of-four
quantum state elimination [52.77024349608834]
A core principle of quantum theory is that non-orthogonal quantum states cannot be perfectly distinguished with single-shot measurements.
Here we implement a quantum state elimination measurement which unambiguously rules out two of four pure, non-orthogonal quantum states.
arXiv Detail & Related papers (2022-06-30T18:00:01Z) - Nonlocal action at a distance also acts in the past [0.0]
The nonlocal action of a measurement can determine the quantum state of a distant entangled particle instantly.
It is demonstrated that the measurement-induced collapse of a quantum entangled state also determines the quantum state of a distant photon in its past.
The past and future are defined with respect to the time of quantum state collapse in the rest frame of a quantum state measurement device.
arXiv Detail & Related papers (2021-09-09T10:23:12Z) - Observing a Quantum Measurement [0.0]
We show that a superposition of both paths may be observed compatibly with properties attributed to state collapse.
Nondestructive measurements of a set of compatible joint observables can be performed.
A novel perspective is given as to why, within unitary quantum theory, ordinary measurements are blind to such superpositions.
arXiv Detail & Related papers (2021-04-30T19:47:13Z) - Entanglement detection in quantum many-body systems using entropic
uncertainty relations [0.0]
We study experimentally accessible lower bounds on entanglement measures based on entropic uncertainty relations.
We derive an improved entanglement bound for bipartite systems, which requires measuring joint probability distributions in only two different measurement settings per subsystem.
arXiv Detail & Related papers (2021-01-21T20:50:11Z) - Bose-Einstein condensate soliton qubit states for metrological
applications [58.720142291102135]
We propose novel quantum metrology applications with two soliton qubit states.
Phase space analysis, in terms of population imbalance - phase difference variables, is also performed to demonstrate macroscopic quantum self-trapping regimes.
arXiv Detail & Related papers (2020-11-26T09:05:06Z) - Quantum Zeno effect appears in stages [64.41511459132334]
In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates.
We show that the onset of the Zeno regime is marked by a $textitcascade of transitions$ in the system dynamics as the measurement strength is increased.
arXiv Detail & Related papers (2020-03-23T18:17:36Z) - Entanglement and the measurement problem [0.0]
The "measurement state" (MS) seems to display paradoxical properties such as multiple macroscopic outcomes.
Analysis of interferometry experiments using entangled photon pairs shows that entangled states differ surprisingly from simple superposition states.
arXiv Detail & Related papers (2020-02-25T20:54:03Z)
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.