Quantenverschränkung

Quantenverschränkung, often translated as quantum entanglement, is a phenomenon in quantum mechanics where two or more quantum particles become linked in such a way that they share the same fate, regardless of the distance separating them. When particles are entangled, measuring a property of one particle instantaneously influences the corresponding property of the other particle(s), even if they are light-years apart. This seemingly paradoxical "spooky action at a distance," as Albert Einstein famously described it, defies classical intuition.

The state of entangled particles cannot be described independently of each other. Instead, they exist in a combined, correlated quantum state. For example, if two photons are entangled in their polarization, measuring the polarization of one photon as vertical will instantly mean the other photon's polarization is horizontal, assuming they were prepared in an anticorrelated state. This correlation is not due to any hidden variables or pre-determined properties; it is an inherent feature of quantum mechanics.

Quantenverschränkung has profound implications for our understanding of reality and is a crucial resource for emerging quantum technologies. It forms the basis for quantum computing, where entangled qubits can perform calculations far beyond the capabilities of classical computers. It is also essential for quantum cryptography, enabling secure communication protocols that are theoretically unbreakable. Despite its counterintuitive nature, quantenverschränkung is a well-established experimental fact, continually verified by physicists worldwide.