Information causality as a physical principle

  title={Information causality as a physical principle},
  author={Marcin Pawłowski and Tomasz Paterek and Dagomir Kaszlikowski and Valerio Scarani and Andreas J. Winter and Marek Żukowski},
Quantum physics has remarkable distinguishing characteristics. For example, it gives only probabilistic predictions (non-determinism) and does not allow copying of unknown states (no-cloning). Quantum correlations may be stronger than any classical ones, but information cannot be transmitted faster than light (no-signalling). However, these features do not uniquely define quantum physics. A broad class of theories exist that share such traits and allow even stronger (than quantum) correlations… 
Bound on genuine multipartite correlations from the principle of information causality
The maximal genuine multipartite correlations under the constraint of information causality is found to be equal to the quantum mechanical bound, consolidates information causability as a physical principle defining the possible correlations allowed by nature, and provides intriguing insights into the limits of genuine multipartsite correlations in quantum theory.
Macroscopically local correlations can violate information causality.
It is shown that the two above-mentioned principles, information causality and macroscopic locality, are inequivalent: if the correlations allowed by nature were the ones satisfying ML, IC would be violated, giving more confidence in IC as a physical principle.
Information Content of Elementary Systems as a Physical Principle
An elementary system information content principle (ICP) whose basic ingredient is the phenomenon of Heisenberg uncertainty that states that the amount of non-redundant information which may be extracted from a given system is bounded by a perfectly decodable information content of the system.
From no-signalling to quantum states
Characterising quantum correlations from physical principles is a central problem in the field of quantum information theory. Entanglement breaks bounds on correlations put by Bell’s theorem, thus
Non-signaling boxes and quantum logics
Using a quantum logic approach we analyze the structure of the so-called non-signaling theories respecting relativistic causality, but allowing correlations violating bounds imposed by quantum
Relativistic independence bounds nonlocality
It is proved that theories with nonlocal correlations stronger than the quantum ones do not satisfy this notion of locality, and therefore, they either violate the underlying generalized uncertainty relations or allow experimenters to nonlocally tamper with the uncertainty relations of their peers.
Cryptographic quantum bound on nonlocality
It is shown that no-signaling resources of pure partially entangled states produce randomness in the communication bits, and achievement of the maximum limit is impossible, i.e., the information causality principle is insufficient for the full identification of the quantum boundaries already for bipartite settings.
No-signalling attacks and implications for (quantum) nonlocality distillation
This work investigates whether nonlocality alone can empower two parties to perform unconditionally secure communication in a feasible manner when only a provably minimal set of assumptions are made for such a task to be possible — independently of the validity of any physical theory (such as quantum theory).
Information-theoretic implications of quantum causal structures.
A general algorithm for computing information-theoretic constraints on the correlations that can arise from a given causal structure, where it allows for quantum systems as well as classical random variables.
Information Causality in the Quantum and Post-Quantum Regime
This work simulates correlations that are stronger than allowed by quantum mechanics by exploiting the effect of polarization-dependent loss in a photonic Bell-test experiment and highlights the special importance of anisotropic regions of the no-signalling polytope in the study of fundamental principles.


Information processing in generalized probabilistic theories
A framework in which a variety of probabilistic theories can be defined, including classical and quantum theories, and many others, is introduced, and a tensor product rule for combining separate systems can be derived.
Quantum Communication Complexity
It is well known that entanglement on its own is useless for the transmission of information, but there are distributed tasks that cannot be accomplished at all in a classical world when communication is not allowed, but that become possible if the non-communicating parties share prior entanglements.
Limit on nonlocality in any world in which communication complexity is not trivial.
A partial answer to the question why are the correlations achievable by quantum mechanics not maximal among those that preserve causality is given by showing that slightly stronger correlations would result in a world in which communication complexity becomes trivial.
Secrecy extraction from no-signaling correlations
Quantum cryptography shows that one can guarantee the secrecy of correlation on the sole basis of the laws of physics, that is, without limiting the computational power of the eavesdropper. The usual
A single quantum cannot be cloned
If a photon of definite polarization encounters an excited atom, there is typically some nonvanishing probability that the atom will emit a second photon by stimulated emission. Such a photon is
Nonlocality and communication complexity
The area of quantum communication complexity is reviewed, and it is shown how it connects the foundational physics questions regarding non-locality with those of communication complexity studied in theoretical computer science.
Negative entropy and information in quantum mechanics
A framework for a quantum mechanical information theory is introduced that is based entirely on density operators, and gives rise to a unified description of classical correlation and quantum
Oblivious transfer and quantum non-locality
  • S. Wolf, Jürg Wullschleger
  • Computer Science, Mathematics
    Proceedings. International Symposium on Information Theory, 2005. ISIT 2005.
  • 2005
This work shows a close connection, in a cryptographic sense, between OT and the "PR primitive," and shows that unconditional OT can be achieved from a single realization of PR, and vice versa.
Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels.
An unknown quantum state \ensuremath{\Vert}\ensuremath{\varphi}〉 can be disassembled into, then later reconstructed from, purely classical information and purely nonclassical Einstein-Podolsky-Rosen