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Nonlocality was discovered by John Bell in 1964, in the context of the debates about quantum theory, but is a phenomenon that can be studied in its own right. Its observation proves that measurements…
Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres
The data imply statistically significant rejection of the local-realist null hypothesis and could be used for testing less-conventional theories, and for implementing device-independent quantum-secure communication and randomness certification.
The second laws of quantum thermodynamics
- F. Brandão, M. Horodecki, N. Ng, J. Oppenheim, S. Wehner
- PhysicsProceedings of the National Academy of Sciences
- 22 May 2013
Here, it is found that for processes which are approximately cyclic, the second law for microscopic systems takes on a different form compared to the macroscopic scale, imposing not just one constraint on state transformations, but an entire family of constraints.
Quantum internet: A vision for the road ahead
What it will take to achieve this so-called quantum internet is reviewed and different stages of development that each correspond to increasingly powerful applications are defined, including a full-blown quantum internet with functional quantum computers as nodes connected through quantum communication channels.
The Uncertainty Principle Determines the Nonlocality of Quantum Mechanics
Two central concepts of quantum mechanics, Heisenberg’s uncertainty principle and a subtle form of nonlocality that Einstein famously called “spooky action at a distance,” are shown to be linked.
Entropic uncertainty relations—a survey
The present survey reviews known results and open questions about entropic uncertainty relations with more than two measurement settings and investigates their importance within quantum information.
Distinguishability of Quantum States Under Restricted Families of Measurements with an Application to Quantum Data Hiding
Lower bounds on the performance of various POVMs acting on a single system such as the isotropic POVM, and spherical 2 and 4-designs are provided, and it is shown how these bounds can lead to certainty relations.
Finite Blocklength Converse Bounds for Quantum Channels
We derive upper bounds on the rate of transmission of classical information over quantum channels by block codes with a given blocklength and error probability, for both entanglement-assisted and…
Entropic uncertainty relations and their applications
This review surveys entropic uncertainty relations that capture Heisenberg’s idea that the results of incompatible measurements are impossible to predict, covering both finite- and infinite-dimensional measurements.
Quantum Anonymous Transmissions
A quantum protocol for sending and receiving classical bits anonymously, which is completely traceless: it successfully prevents later reconstruction of the sender and introduces a new primitive called anonymous entanglement, which may be useful in other contexts as well.