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ENTANGLED QUANTUM STATES, QUANTUM TELEPORTATION AND QUANTUM INFORMATION

Constantin P. Cristescu, Marcel Popescu

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

Starile cuantice neseparabile (incâlcite) reprezinta elemente de importanţa fundamentala in informatica cuantica. Acest articol prezinta esenţa starilor neseparabile, unele experimente care au demonstrat existenţa acestora, in principal pe baza dezbaterii de peste 70 de ani provocata de “paradoxul Einstein, Podolsky, Rosen (EPR)”, precum si principalele experimente care au atenuat considerabil disputa. Se descriu cele mai importante experimente de teleportare cuantica si se prezinta unele implicaţii ale acesteia in transmiterea informaţiei. The paper presents the essentials concerning the quantum entangled states as a fundamental resource for quantum informatics. The treatment roughly follows the debate of over 70 years generated by the Einstein, Podolsky, Rosen paper formulating what was later called “the EPR paradox”, and presents the celebrated experiments that settled the debate. Recent experiments on the application of entangled states such as quantum teleportation and its relevance for quantum communications are discussed.

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Starile cuantice neseparabile (incâlcite) reprezinta elemente de importanţa fundamentala in informatica cuantica. Acest articol prezinta esenţa starilor neseparabile, unele experimente care au demonstrat existenţa acestora, in principal pe baza dezbaterii de peste 70 de ani provocata de “paradoxul Einstein, Podolsky, Rosen (EPR)”, precum si principalele experimente care au atenuat considerabil disputa. Se descriu cele mai importante experimente de teleportare cuantica si se prezinta unele implicaţii ale acesteia in transmiterea informaţiei. The paper presents the essentials concerning the quantum entangled states as a fundamental resource for quantum informatics. The treatment roughly follows the debate of over 70 years generated by the Einstein, Podolsky, Rosen paper formulating what was later called “the EPR paradox”, and presents the celebrated experiments that settled the debate. Recent experiments on the application of entangled states such as quantum teleportation and its relevance for quantum communications are discussed.
Quantum entanglement was once a subject of intense philosophical debate and regarded as a puzzling theoretical anomaly. However, it has now been empirically validated and is widely recognized as a fundamental feature of quantum mechanics. This review traces its development in chronological order, beginning with the Einstein–Podolsky–Rosen (EPR) paradox, which raised profound questions about the completeness of quantum theory, and John Stewart Bell’s subsequent theorem, which established a measurable framework to verify entanglement’s non-local nature. The discussion then turns to contemporary experimental and applied domains where entanglement serves as a critical resource. Notable examples include quantum teleportation, entanglement-enhanced metrology, quantum radar, and emerging quantum energy devices such as quantum batteries. The transition from theoretical dispute to practical application underscores how entanglement now enables tangible technologies—ranging from ultra-secure communication networks to highly precise sensors. Furthermore, potential interdisciplinary applications in fields such as quantum biology are also explored, suggesting new pathways for innovation. This review aims to bridge foundational concepts with current technological advances, illustrating the continuing impact of quantum entanglement on both scientific understanding and real-world engineering.
Quantum entanglement is a peculiar phenomenon in quantum information science, characterized by nonclassical correlations between quantum states of subsystems in a quantum system. Since the proposal of the Einstein-Podolsky-Rosen (EPR) paradox by Einstein, Podolsky, and Rosen, quantum entanglement has sparked intense debates on local realism. Bell’s inequality experiment established the nonlocality of quantum mechanics. Currently, high-dimensional quantum entanglement of both deterministic and random states can be realized in systems such as photons and cold atoms. Technologies such as quantum teleportation, quantum teleportation, quantum computing, and others rely on quantum entanglement to achieve effects beyond classical limitations. Current research focuses on the implementation of macroscopic quantum entanglement and its significance in fundamental problems of quantum mechanics. Quantum entanglement opens up a new paradigm for information processing with broad application prospects. It is necessary to conduct in-depth research on the nature of quantum entanglement and its advantages in information processing. This paper reviews the theoretical foundations of quantum entanglement, methods of generation and detection, and research progress in its applications in the field of quantum information. It discusses the important applications of quantum entanglement in quantum communication, computing, and sensing and provides an outlook on the future development prospects of quantum entanglement technologies.
This Colloquium examines the field of the Einstein, Podolsky, and Rosen (EPR) gedanken experiment, from the original paper of Einstein, Podolsky, and Rosen, through to modern theoretical proposals of how to realize both the continuous-variable and discrete versions of the EPR paradox. The relationship with entanglement and Bell's theorem are analyzed, and the progress to date towards experimental confirmation of the EPR paradox is summarized, with a detailed treatment of the continuous-variable paradox in laser-based experiments. Practical techniques covered include continuous-wave parametric amplifier and optical fiber quantum soliton experiments. Current proposals for extending EPR experiments to massive-particle systems are discussed, including spin squeezing, atomic position entanglement, and quadrature entanglement in ultracold atoms. Finally, applications of this technology to quantum key distribution, quantum teleportation, and entanglement swapping are examined.
This Colloquium examines the field of the EPR Gedankenexperiment, from the original paper of Einstein, Podolsky and Rosen, through to modern theoretical proposals of how to realize both the continuous-variable and discrete versions of the EPR paradox. We analyze the relationship with entanglement and Bell's theorem, and summarize the progress to date towards experimental confirmation of the EPR paradox, with a detailed treatment of the continuous-variable paradox in laser-based experiments. Practical techniques covered include continuous-wave parametric amplifier and optical fibre quantum soliton experiments. We discuss current proposals for extending EPR experiments to massive-particle systems, including spin-squeezing, atomic position entangle- ment, and quadrature entanglement in ultra-cold atoms. Finally, we examine applications of this technology to quantum key distribution, quantum teleportation and entanglement-swapping.
Instead of having to rely on gedanken (thought) experiments, it is possible to base this discussion of the foundations of quantum physics on actually performed experiments because of the enormous experimental progress in recent years. For reasons of space, the author discusses mainly experiments related to the Einstein-Podolsky-Rosen paradox and Bell's theorem, that is, to quantum entanglement. Not only have such fundamental experiments realized many historic proposals, they also helped to sharpen our quantum intuition. This recently led to the development of a new field, quantum information, where quantum teleportation and quantum computation are some of the most fascinating topics. Finally the author ventures into a discussion of future prospects in experiment and theory.