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Chinese Physics C

Breakdown of Entanglement during the Teleportation

Wang Jin

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

The teleportation may become an important means for remote distance communications in the future,and the mechanism is based on entanglement of quantum states.But the entanglement is fragile.As the state is disturbed by the environment the entanglement may be broken down.In this work,we choose the electron-positron pair in an entangled state of spin 0 as an example to investigate the rate of breaking down of the entanglement by the Compton scattering with the background radiation photons or Bremstrahlung with strong magnetic fields of some astronomical objects which the electron or positron passes by.Since the spin projection of single electron (positron) is not physically measurable and the electron beams cannot keep its shape for long because of the Coulomb repulsion among the charged particles in the beam,the only way is to shoot one electron-positron pair each time and continuously repeat the processes.With all the restraints this study has only pedagogic meaning, but may shed light on further studies where other information messagers are chosen.

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Setup to study the Compton scattering of entangled annihilation photons

Alexander O. Strizhak, J. N. Abdurashitov, А. Г. Баранов +6 more

The experimental setup to study the difference between Compton scattering of entangled and decoherent annihilation photons is discussed. The pairs of entangled gammas are born in electron-positron annihilation at rest. The polarization state of each photon in such a pair is not definite and represents the superposition of horizontal and vertical polarizations, while the relative polarizations of the photons are orthogonal. After interaction with the environment (for example, via the Compton scattering) the entangled pair of photons is broken and the pair becomes decoherent with determined polarizations of both gammas. Since the Compton scattering depends on the polarization of the initial photon, the scattering kinematics of entangled and decoherent photons might be quite different. At present, there is no experimental comparison of the Compton scattering kinematics for entangled and decoherent gammas.

Journal of Physics Conference Series•Nov 1, 2022•1 citation

Quantum Entanglement from Positronium Decay

Forrest Bullard

IntroductionIn this experiment we will explore whether photons emitted from the decay of positronium, a positron-electron composition, are quantum entangled. When talking about quantum entangled particles it is impossible to fully represent the quantum state of one particle independently of another such that if we know one photon from an entangled pair is horizontally polarized then the other must be vertically polarized. We will use this concept along with knowledge from previous experiments on positron-electron annihilation and Compton scattering to try to determine the truth of this model.ProcedureIn this experiment we used two NaI detectors, photo-multiplier tubes (PMT), pre-amplifiers, and amplifiers. Along with two single channel analyzers, a logic gate, a coincidence detector, a high-voltage supply, and a multi-channel analyzer (MCA) and of course two aluminum targets, a sodium-22 radioactive source, and loads of lead bricks. Our source was encased in the center of our detector configuration such that radiation from the source was focused towards both aluminum targets placed opposite of each other with respect to the source. Both detectors were then stationed so that photons coming from the source were detected after a 90 degree Compton scattering from the target. This ninety degree correlation is necessary for proof of quantum entanglement as we expect no coincidences to occur when both detectors are in the same plane do to quantum pairs anti-correlated polarization causing expected scattering to be related by this ninety degree angle. The picture below shows the basic geometry of this set up.

•Dec 14, 2020•0 citations

Study of the Compton Scattering of Entangled Annihilation Photons

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Abstract The experimental setup for study of Compton scattering of entangled and decoherent annihilation gammas is described. These gammas are born in two-photon positron-electron annihilation. Polarizations of annihilation gammas are mutually orthogonal, while the polarization of each photon is indefinite. If one of the photons of the pair interacts with matter, the pair becomes decoherent and photons acquire the determined polarization states. The kinematics of Compton scattering depends on the polarization states and can be different for entangled and decoherent pairs of annihilation photons. The angular correlations of scattered gammas for both, entangled and decoherent states are measured and compared. It is shown, that the kinematics of Compton scattering are similar for both cases.

Physics of Particles and Nuclei Letters•Oct 1, 2022•6 citations

Communication Through Entanglement Transfer

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In our previous paper [1] we claim that based on conservation laws (e.g. spin, angular momentum, gravity, time dilation etc.) in some cases, matter and antimatter pairs (e.g. electron and positron pair) produced from photonic pure energy are entangled. Furthermore, if there are two identical pair production procedures ,A & B ,and an electron from entangled pair A annihilates with the positron of entangled pair B ,from conservation laws consideration the left behind positron from pair A and the left behind electron from pair B become entangled and we will refer to this event as entanglement transfer (Fig. 1).This phenomena can be examined at the LHC and if proven to be correct it is another proof that entanglement is truly a “spooky action at a distance” (EPR paradox) .As we will explain in this paper, This phenomena of entanglement transfer can be used for non-local communication applications.

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The Role of Entangled States in Quantum Teleportation

Dr. John Smith

Quantum teleportation represents a groundbreaking technique in quantum information science that allows for the transfer of quantum states between distant parties without physically transmitting the particle itself. This phenomenon relies heavily on quantum entanglement, where the states of two particles become correlated in such a way that the state of one can be immediately known by measuring the other. This article explores the role of entangled states in quantum teleportation, explaining their fundamental importance, the mechanisms of their creation, and the practical implications for future quantum communication systems. Furthermore, it examines the theoretical models and experimental implementations that demonstrate the viability of quantum teleportation.

American Journal Of Pure And Applied Physics•Dec 31, 2024•0 citations
The teleportation may become an important means for remote distance communications in the future,and the mechanism is based on entanglement of quantum states.But the entanglement is fragile.As the state is disturbed by the environment the entanglement may be broken down.In this work,we choose the electron-positron pair in an entangled state of spin 0 as an example to investigate the rate of breaking down of the entanglement by the Compton scattering with the background radiation photons or Bremstrahlung with strong magnetic fields of some astronomical objects which the electron or positron passes by.Since the spin projection of single electron (positron) is not physically measurable and the electron beams cannot keep its shape for long because of the Coulomb repulsion among the charged particles in the beam,the only way is to shoot one electron-positron pair each time and continuously repeat the processes.With all the restraints this study has only pedagogic meaning, but may shed light on further studies where other information messagers are chosen.
The experimental setup to study the difference between Compton scattering of entangled and decoherent annihilation photons is discussed. The pairs of entangled gammas are born in electron-positron annihilation at rest. The polarization state of each photon in such a pair is not definite and represents the superposition of horizontal and vertical polarizations, while the relative polarizations of the photons are orthogonal. After interaction with the environment (for example, via the Compton scattering) the entangled pair of photons is broken and the pair becomes decoherent with determined polarizations of both gammas. Since the Compton scattering depends on the polarization of the initial photon, the scattering kinematics of entangled and decoherent photons might be quite different. At present, there is no experimental comparison of the Compton scattering kinematics for entangled and decoherent gammas.
IntroductionIn this experiment we will explore whether photons emitted from the decay of positronium, a positron-electron composition, are quantum entangled. When talking about quantum entangled particles it is impossible to fully represent the quantum state of one particle independently of another such that if we know one photon from an entangled pair is horizontally polarized then the other must be vertically polarized. We will use this concept along with knowledge from previous experiments on positron-electron annihilation and Compton scattering to try to determine the truth of this model.ProcedureIn this experiment we used two NaI detectors, photo-multiplier tubes (PMT), pre-amplifiers, and amplifiers. Along with two single channel analyzers, a logic gate, a coincidence detector, a high-voltage supply, and a multi-channel analyzer (MCA) and of course two aluminum targets, a sodium-22 radioactive source, and loads of lead bricks. Our source was encased in the center of our detector configuration such that radiation from the source was focused towards both aluminum targets placed opposite of each other with respect to the source. Both detectors were then stationed so that photons coming from the source were detected after a 90 degree Compton scattering from the target. This ninety degree correlation is necessary for proof of quantum entanglement as we expect no coincidences to occur when both detectors are in the same plane do to quantum pairs anti-correlated polarization causing expected scattering to be related by this ninety degree angle. The picture below shows the basic geometry of this set up.
Abstract The experimental setup for study of Compton scattering of entangled and decoherent annihilation gammas is described. These gammas are born in two-photon positron-electron annihilation. Polarizations of annihilation gammas are mutually orthogonal, while the polarization of each photon is indefinite. If one of the photons of the pair interacts with matter, the pair becomes decoherent and photons acquire the determined polarization states. The kinematics of Compton scattering depends on the polarization states and can be different for entangled and decoherent pairs of annihilation photons. The angular correlations of scattered gammas for both, entangled and decoherent states are measured and compared. It is shown, that the kinematics of Compton scattering are similar for both cases.
In our previous paper [1] we claim that based on conservation laws (e.g. spin, angular momentum, gravity, time dilation etc.) in some cases, matter and antimatter pairs (e.g. electron and positron pair) produced from photonic pure energy are entangled. Furthermore, if there are two identical pair production procedures ,A & B ,and an electron from entangled pair A annihilates with the positron of entangled pair B ,from conservation laws consideration the left behind positron from pair A and the left behind electron from pair B become entangled and we will refer to this event as entanglement transfer (Fig. 1).This phenomena can be examined at the LHC and if proven to be correct it is another proof that entanglement is truly a “spooky action at a distance” (EPR paradox) .As we will explain in this paper, This phenomena of entanglement transfer can be used for non-local communication applications.
Quantum teleportation represents a groundbreaking technique in quantum information science that allows for the transfer of quantum states between distant parties without physically transmitting the particle itself. This phenomenon relies heavily on quantum entanglement, where the states of two particles become correlated in such a way that the state of one can be immediately known by measuring the other. This article explores the role of entangled states in quantum teleportation, explaining their fundamental importance, the mechanisms of their creation, and the practical implications for future quantum communication systems. Furthermore, it examines the theoretical models and experimental implementations that demonstrate the viability of quantum teleportation.