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Aspect experiment. The source S produces pairs of "photons", sent in opposite directions. Each photon encounters a two-channel polariser whose orientation (a or b) can be set by the experimenter. Emerging signals from each channel are detected and coincidences of four types (++, −−, +− and −+) counted by the coincidence monitor.
Blais' YouTube video generated over 17,000 hits in its first five days [9] and had almost 800 thousand views as of April 2017. [8] The video took Blais 60 hours to complete. [ 10 ] Blais' second video, "Bohemian Gravity," parodied Queen's " Bohemian Rhapsody " to explain string theory .
In quantum information theory, superdense coding (also referred to as dense coding) is a quantum communication protocol to communicate a number of classical bits of information by only transmitting a smaller number of qubits, under the assumption of sender and receiver pre-sharing an entangled resource.
In quantum information theory, a quantum channel is a communication channel which can transmit quantum information, as well as classical information. An example of quantum information is the general dynamics of a qubit. An example of classical information is a text document transmitted over the Internet.
In quantum information theory, the channel-state duality refers to the correspondence between quantum channels and quantum states (described by density matrices).Phrased differently, the duality is the isomorphism between completely positive maps (channels) from A to C n×n, where A is a C*-algebra and C n×n denotes the n×n complex entries, and positive linear functionals on the tensor product
In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak ...
In quantum information theory, the identity channel is a noise-free quantum channel. That is, the channel outputs exactly what was put in. [ 1 ] The identity channel is commonly denoted as I {\displaystyle I} , i d {\displaystyle {\mathsf {id}}} or I {\displaystyle \mathbb {I} } .
Quantum mechanics is a fundamental theory that describes the behavior of nature at and below the scale of atoms. [2]: 1.1 It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science.