Conditions for the compatibility of channels in general probabilistic theory and their connection to steering and Bell nonlocality
arXiv:1707.08650 · doi:10.1103/PhysRevA.96.052127
Abstract
We derive general conditions for the compatibility of channels in general probabilistic theory. We introduce formalism that allows us to easily formulate steering by channels and Bell nonlocality of channels as generalizations of the well-known concepts of steering by measurements and Bell nonlocality of measurements. The generalization does not follow the standard line of thinking stemming from the Einstein-Podolsky-Rosen paradox, but introduces steering and Bell nonlocality as entanglement-assisted incompatibility tests. We show that all of the proposed definitions are, in the special case of measurements, the same as the standard definitions, but not all of the known results for measurements generalize to channels. For example, we show that for quantum channels, steering is not a necessary condition for Bell nonlocality. We further investigate the introduced conditions and concepts in the special case of quantum theory and we provide many examples to demonstrate these concepts and their implications.
References in corpus (13)
- Device-independent security of quantum cryptography against collective attacks
- Steering, Entanglement, Nonlocality, and the EPR Paradox
- Private Randomness Expansion With Untrusted Devices
- A generalized no-broadcasting theorem
- Joint measurability of generalized measurements implies classicality
- Quantum marginal problem and representations of the symmetric group
- Notes on Joint Measurability of Quantum Observables
- Process POVM: A mathematical framework for the description of process tomography experiments
- Cloning and Broadcasting in Generic Probabilistic Theories
- Incompatibility of quantum channels
- All measurements in a probabilistic theory are compatible if and only if the state space is a simplex
- A necessary condition for incompatibility of observables in general probabilistic theories
- Improved Measurement-Device-Independent Quantum Key Distribution with Uncharacterized Qubits