Quantum Entanglement State
A Quantum Entanglement State is a quantum state that occurs when pairs or groups of particles are generated or interact in ways such that the quantum state of each particle cannot be described independently.
- Context:
- It can allow one to know that the spin state of one entangled particle (up or down) is in the opposite direction to that of its mate.
- It can allow Qubits that are separated by incredible distances to interact with each other instantaneously (not limited to the speed of light).
- …
- Counter-Example(s):
- See: Particle, Quantum State, Measurement Problem, Position (Vector), Momentum, Spin (Physics), Polarization (Waves), Correlation, Quantum Indeterminacy.
References
2014
- (Wikipedia, 2014) ⇒ http://en.wikipedia.org/wiki/quantum_entanglement Retrieved:2014-7-26.
- Quantum entanglement is a physical phenomenon that occurs when pairs or groups of particles are generated or interact in ways such that the quantum state of each particle cannot be described independently – instead, a quantum state may be given for the system as a whole.
Measurements of physical properties such as position, momentum, spin, polarization, etc. performed on entangled particles are found to be appropriately correlated. For example, if a pair of particles is generated in such a way that their total spin is known to be zero, and one particle is found to have clockwise spin on a certain axis, then the spin of the other particle, measured on the same axis, will be found to be counterclockwise. Because of the nature of quantum measurement, however, this behavior gives rise to effects that can appear paradoxical: any measurement of a property of a particle can be seen as acting on that particle (e.g. by collapsing a number of superimposed states); and in the case of entangled particles, such action must be on the entangled system as a whole. It thus appears that one particle of an entangled pair "knows" what measurement has been performed on the other, and with what outcome, even though there is no known means for such information to be communicated between the particles, which at the time of measurement may be separated by arbitrarily large distances.
Such phenomena were the subject of a 1935 paper by Albert Einstein, Boris Podolsky and Nathan Rosen, describing what came to be known as the EPR paradox, and several papers by Erwin Schrödinger shortly thereafter. Einstein and others considered such behavior to be impossible, as it violated the local realist view of causality (Einstein referred to it as "spooky action at a distance"), [1] and argued that the accepted formulation of quantum mechanics must therefore be incomplete. Later, however, the counterintuitive predictions of quantum mechanics were verified experimentally. [2] Experiments have been performed involving measuring the polarization or spin of entangled particles in different directions, which – by producing violations of Bell's inequality – demonstrate statistically that the local realist view cannot be correct. This has been shown to occur even when the measurements are performed more quickly than light could travel between the sites of measurement: there is no lightspeed or slower influence that can pass between the entangled particles. [3] Recent experiments have measured entangled particles within less than one part in 10,000 of the light travel time between them. According to the formalism of quantum theory, the effect of measurement happens instantly. [4] It is not possible, however, to use this effect to transmit classical information at faster-than-light speeds [5] (see Faster-than-light → Quantum mechanics). Quantum entanglement is an area of extremely active research by the physics community, and its effects have been demonstrated experimentally with photons, electrons, molecules the size of buckyballs, [6] [7] and even small diamonds. [8] Research is also focused on the utilization of entanglement effects in communication and computation.
- Quantum entanglement is a physical phenomenon that occurs when pairs or groups of particles are generated or interact in ways such that the quantum state of each particle cannot be described independently – instead, a quantum state may be given for the system as a whole.
- ↑ Physicist John Bell depicts the Einstein camp in this debate in his article entitled "Bertlmann's socks and the nature of reality", p. 142 of Speakable and unspeakable in quantum mechanics: "For EPR that would be an unthinkable 'spooky action at a distance'. To avoid such action at a distance they have to attribute, to the space-time regions in question, real properties in advance of observation, correlated properties, which predetermine the outcomes of these particular observations. Since these real properties, fixed in advance of observation, are not contained in quantum formalism, that formalism for EPR is incomplete. It may be correct, as far as it goes, but the usual quantum formalism cannot be the whole story." And again on p. 144 Bell says: "Einstein had no difficulty accepting that affairs in different places could be correlated. What he could not accept was that an intervention at one place could influence, immediately, affairs at the other." Downloaded 5 July 2011 from
- ↑ 75 years of entanglement | Science News
- ↑ Francis, Matthew. Quantum entanglement shows that reality can't be local, Ars Technica, 30 October 2012
- ↑ Matson, John. Quantum teleportation achieved over record distances, Nature, 13 August 2012
- ↑ Roger Penrose, The Road to Reality: A Complete Guide to the Laws of the Universe, London, 2004, p. 603.
- ↑ Nature: Wave–particle duality of C60 molecules, 14 October 1999. Abstract, subscription needed for full text
- ↑ Olaf Nairz, Markus Arndt, and Anton Zeilinger, "Quantum interference experiments with large molecules", American Journal of Physics, 71 (April 2003) 319-325.
- ↑ sciencemag.org, supplementary materials