Information causality is a
physical principle suggested in 2009. Information Causality states that information gain that a receiver (Bob) can reach about data, previously unknown to him, from a sender (Alice), by using all his local resources and
classical bits communicated by the sender, is at most
bits.
The principle assumes classical communication: if quantum bits were allowed to be transmitted the information gain could be higher as demonstrated in the quantum
superdense coding
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 assum ...
protocol
his is debatable as superdense coding requires sending as many qubits - including auxiliary channels - as there are classical bits to transfer The principle is respected by all correlations accessible with quantum physics, while it excludes all correlations which violate the quantum
Tsirelson bound for the CHSH inequality. However, it does not exclude beyond-quantum correlations in multipartite situations.
See also
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Tsirelson's bound
A Tsirelson bound is an upper limit to quantum mechanical correlations between distant events. Given that quantum mechanics violates Bell inequalities (i.e., it cannot be described by a local hidden-variable theory), a natural question to ask is h ...
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Quantum nonlocality
In theoretical physics, quantum nonlocality refers to the phenomenon by which the measurement statistics of a multipartite quantum system do not admit an interpretation in terms of a local realistic theory. Quantum nonlocality has been experimen ...
References
Quantum information science
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