European Physical Society Conference on High Energy Physics (EPS-HEP)

Observation of the post-tagging effect for entangled K mesons at KLOE

ANTONIO DI DOMENICO

Published Jan 29, 2024• 0 citations

Abstract

Novel quantum phenomena have been recently discussed in association to a peculiar time correlation between entangled neutral kaons produced at a $\phi$-factory: the past state of the first decayed kaon, when it was still entangled before its decay, is post-tagged by the result and the time of the future observation on the other kaon decay. This surprising ``from future to past'' effect is fully observable. Preliminary results obtained on the analysis of data collected by the KLOE experiment at the DA$\Phi$NE collider are presented, showing experimental evidence of this new effect.

DOI: 10.22323/1.449.0371

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European Physical Society Conference on High Energy Physics (EPS-HEP)

Observation of the post-tagging effect for entangled K mesons at KLOE

ANTONIO DI DOMENICO

Published Jan 29, 2024• 0 citations

Publisher

Abstract

Novel quantum phenomena have been recently discussed in association to a peculiar time correlation between entangled neutral kaons produced at a

\phi

-factory: the past state of the first decayed kaon, when it was still entangled before its decay, is post-tagged by the result and the time of the future observation on the other kaon decay. This surprising ``from future to past'' effect is fully observable. Preliminary results obtained on the analysis of data collected by the KLOE experiment at the DA

\Phi

NE collider are presented, showing experimental evidence of this new effect.

DOI: 10.22323/1.449.0371

Related papers

Can future observation of the living partner post-tag the past decayed state in entangled neutral K-mesons?

ANTONIO DI DOMENICO

Abstract Novel quantum phenomena have been recently discussed [1] in association to a peculiar time correlation between entangled neutral kaons produced at a ϕ-factory: the past state of the first decayed kaon, when it was still entangled before its decay, is post-tagged by the result and the time of the future observation on the other kan decay. This surprising “from future to past” effect is fully observable and leads to the unique experimental tag of the KS state, an unsolved problem since the discovery of CP violation. The first preliminary results obtained on the analysis of data collected by the KLOE experiment at the DAΦNE collider, and showing experimental evidence of this new effect are presented.Abstract Novel quantum phenomena have been recently discussed [1] in association to a peculiar time correlation between entangled neutral kaons produced at a ϕ-factory: the past state of the first decayed kaon, when it was still entangled before its decay, is post-tagged by the result and the time of the future observation on the other kan decay. This surprising “from future to past” effect is fully observable and leads to the unique experimental tag of the KS state, an unsolved problem since the discovery of CP violation. The first preliminary results obtained on the analysis of data collected by the KLOE experiment at the DAΦNE collider, and showing experimental evidence of this new effect are presented.

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Can future observation of the living partner post-tag the past decayed state in entangled neutral K mesons?

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Entangled neutral K-mesons allow the study of their correlated dynamics at interference and decoherence times not accessible in any other system. We find novel quantum phenomena associated to a correlation-in-time between the two partners: the state of the first decayed Kaon, when it was entangled before its decay, is influenced by the result and the time of the future observation of the second decay channel. This surprising from future to past effect is fully observable and leads to the unique experimental tag of the KS-state, an unsolved problem since the discovery of CP violation.Entangled neutral K-mesons allow the study of their correlated dynamics at interference and decoherence times not accessible in any other system. We find novel quantum phenomena associated to a correlation-in-time between the two partners: the state of the first decayed Kaon, when it was entangled before its decay, is influenced by the result and the time of the future observation of the second decay channel. This surprising from future to past effect is fully observable and leads to the unique experimental tag of the KS-state, an unsolved problem since the discovery of CP violation.

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The Einstein-Podolsky-Rosen (EPR) entanglement of a neutral K-meson (kaon) pair enjoys the peculiar quantum behaviour of mixing, charge-parity ${\cal CP}$ violation ( ${\cal C}$ - charge conjugation, ${\cal P}$ - parity) and two non-orthogonal eigenstates of definite time evolution $K_L$ and $K_S$ with very different lifetimes. The dynamics of this strange entanglement, experimentally accessible at the $\phi$ -factory, makes possible the search for novel phenomena not accessible in any other system, i.e. at interference times and at decoherence times of the single partners after their disentanglement, in order to unveil the nature of the correlation between the two neutral kaons. Until now, the studies have been concentrated on the single kaon intensity distribution between the two decay times $t_1$ and $t_2$ with $\Delta t = t_2 - t_1 > 0$ . Here we show that the entire two single time distributions, before each decay, are physical in both senses: past to future, leading to the state of the living partner at time $t_2$ from the observation of the first decay channel at $t_1$ , and future to past, leading to the past state of the decayed kaon at time $t_1$ from the observation of the second decay channel at $t_2$ . Our results thus demonstrate an affirmative answer to the title: it does, the past decayed state depends on the result of the future measurement for the living partner. This novel effect is truly observable through the first decay time distributions. Besides the implications for quantum physics for all $\Delta t$ , at large decoherence times the resulting first decayed state is always $K_S$ , providing a genuine tag of this kaon state in the decoherence region, and a unique and important experimental tool to prepare a pure $K_S$ beam.The Einstein-Podolsky-Rosen (EPR) entanglement of a neutral K-meson (kaon) pair enjoys the peculiar quantum behaviour of mixing, charge-parity ${\cal CP}$ violation (${\cal C}$ - charge conjugation, ${\cal P}$ - parity) and two non-orthogonal eigenstates of definite time evolution $K_L$ and $K_S$ with very different lifetimes. The dynamics of this strange entanglement, experimentally accessible at the $\phi$-factory, makes possible the search for novel phenomena not accessible in any other system, i.e. at interference times and at decoherence times of the single partners after their disentanglement, in order to unveil the nature of the correlation between the two neutral kaons. Until now, the studies have been concentrated on the single kaon intensity distribution between the two decay times $t_1$ and $t_2$ with $\Delta t = t_2 - t_1 > 0$. Here we show that the entire two single time distributions, before each decay, are physical in both senses: past to future, leading to the state of the living partner at time $t_2$ from the observation of the first decay channel at $t_1$, and future to past, leading to the past state of the decayed kaon at time $t_1$ from the observation of the second decay channel at $t_2$. Our results thus demonstrate an affirmative answer to the title: it does, the past decayed state depends on the result of the future measurement for the living partner. This novel effect is truly observable through the first decay time distributions. Besides the implications for quantum physics for all $\Delta t$, at large decoherence times the resulting first decayed state is always $K_S$, providing a genuine tag of this kaon state in the decoherence region, and a unique and important experimental tool to prepare a pure $K_S$ beam.

Dec 10, 20191 citation

Precision tests of Quantum Mechanics and CPT symmetry with entangled neutral kaons at KLOE

D. Babusci, M. Berlowski, C. Bloise +55 more

The quantum interference between the decays of entangled neutral kaons is studied in the process $ϕ\rightarrow K_S K_L \rightarrowπ^+π^-π^+π^-$ , which exhibits the characteristic Einstein--Podolsky--Rosen correlations that prevent both kaons to decay into $π^+π^-$ at the same time. This constitutes a very powerful tool for testing at the utmost precision the quantum coherence of the entangled kaon pair state, and to search for tiny decoherence and CPT violation effects, which may be justified in a quantum gravity framework. The analysed data sample was collected with the KLOE detector at DA $Φ$ NE, the Frascati $ϕ$ -factory, and corresponds to an integrated luminosity of about 1.7 fb $^{-1}$ , i.e. to about $1.7 \times 10^9$ $ϕ\rightarrow K_S K_L$ decays produced. From the fit of the observed $Δt$ distribution, being $Δt$ the difference of the kaon decay times, the decoherence and CPT violation parameters of various phenomenological models are measured with a largely improved accuracy with respect to previous analyses. The results are consistent with no deviation from quantum mechanics and CPT symmetry, while for some parameters the precision reaches the interesting level at which -- in the most optimistic scenarios -- quantum gravity effects might show up. They provide the most stringent limits up to date on the considered models.The quantum interference between the decays of entangled neutral kaons is studied in the process $ϕ\rightarrow K_S K_L \rightarrowπ^+π^-π^+π^-$, which exhibits the characteristic Einstein--Podolsky--Rosen correlations that prevent both kaons to decay into $π^+π^-$ at the same time. This constitutes a very powerful tool for testing at the utmost precision the quantum coherence of the entangled kaon pair state, and to search for tiny decoherence and CPT violation effects, which may be justified in a quantum gravity framework. The analysed data sample was collected with the KLOE detector at DA$Φ$NE, the Frascati $ϕ$-factory, and corresponds to an integrated luminosity of about 1.7 fb$^{-1}$, i.e. to about $1.7 \times 10^9$ $ϕ\rightarrow K_S K_L$ decays produced. From the fit of the observed $Δt$ distribution, being $Δt$ the difference of the kaon decay times, the decoherence and CPT violation parameters of various phenomenological models are measured with a largely improved accuracy with respect to previous analyses. The results are consistent with no deviation from quantum mechanics and CPT symmetry, while for some parameters the precision reaches the interesting level at which -- in the most optimistic scenarios -- quantum gravity effects might show up. They provide the most stringent limits up to date on the considered models.

arXiv:2111.04328Nov 8, 20212 citations

Erasing the Past and Impacting the Future with Kaons at a Phi-factory

Beatrix C. Hiesmayr

International Conference on Kaon Physics (KAON)Feb 5, 20080 citations

Novel quantum phenomena have been recently discussed in association to a peculiar time correlation between entangled neutral kaons produced at a

\phi

\Phi

NE collider are presented, showing experimental evidence of this new effect.

Entangled neutral

K

mesons allow for the study of their correlated dynamics at interference and decoherence times not accessible in any other system. We find novel quantum phenomena associated to a correlation in time between the two partners: The past state of the first decayed kaon, when it was entangled before its decay, is post-tagged by the result and the time of the future observation of the second decay channel. This surprising ``from future to past'' effect is fully observable and leads to the unique experimental tag of the

{K}_{S}

state, an unsolved problem since the discovery of

CP

violation.

The Einstein-Podolsky-Rosen (EPR) entanglement of a neutral K-meson (kaon) pair enjoys the peculiar quantum behaviour of mixing, charge-parity

{\cal CP}

violation (

{\cal C}

- charge conjugation,

{\cal P}

- parity) and two non-orthogonal eigenstates of definite time evolution

K_L

and

K_S

with very different lifetimes. The dynamics of this strange entanglement, experimentally accessible at the

\phi

-factory, makes possible the search for novel phenomena not accessible in any other system, i.e. at interference times and at decoherence times of the single partners after their disentanglement, in order to unveil the nature of the correlation between the two neutral kaons. Until now, the studies have been concentrated on the single kaon intensity distribution between the two decay times

t_1

and

t_2

with

\Delta t = t_2 - t_1 > 0

. Here we show that the entire two single time distributions, before each decay, are physical in both senses: past to future, leading to the state of the living partner at time

t_2

from the observation of the first decay channel at

t_1

, and future to past, leading to the past state of the decayed kaon at time

t_1

from the observation of the second decay channel at

t_2

. Our results thus demonstrate an affirmative answer to the title: it does, the past decayed state depends on the result of the future measurement for the living partner. This novel effect is truly observable through the first decay time distributions. Besides the implications for quantum physics for all

\Delta t

, at large decoherence times the resulting first decayed state is always

K_S

, providing a genuine tag of this kaon state in the decoherence region, and a unique and important experimental tool to prepare a pure

K_S

beam.

The quantum interference between the decays of entangled neutral kaons is studied in the process

ϕ\rightarrow K_S K_L \rightarrowπ^+π^-π^+π^-

, which exhibits the characteristic Einstein--Podolsky--Rosen correlations that prevent both kaons to decay into

π^+π^-

at the same time. This constitutes a very powerful tool for testing at the utmost precision the quantum coherence of the entangled kaon pair state, and to search for tiny decoherence and CPT violation effects, which may be justified in a quantum gravity framework. The analysed data sample was collected with the KLOE detector at DA

Φ

NE, the Frascati

ϕ

-factory, and corresponds to an integrated luminosity of about 1.7 fb

^{-1}

, i.e. to about

1.7 \times 10^9

ϕ\rightarrow K_S K_L

decays produced. From the fit of the observed

Δt

distribution, being

Δt

the difference of the kaon decay times, the decoherence and CPT violation parameters of various phenomenological models are measured with a largely improved accuracy with respect to previous analyses. The results are consistent with no deviation from quantum mechanics and CPT symmetry, while for some parameters the precision reaches the interesting level at which -- in the most optimistic scenarios -- quantum gravity effects might show up. They provide the most stringent limits up to date on the considered models.