Posts for the Topic quantum states

A blog written by quantum researchers for quantum researchers and those interested in their work.

How to enhance separability and entanglement of quantum states

A quantum state \(\rho\) that is shared between two parties is called separable if it can be written as a convex combination of local quantum states \(\{\sigma_i\}\) and \(\{\tau_i\}\):

\[\rho = \sum_i p_i \sigma_i \otimes \tau_i.\]

States that are not separable are called entangled, and the distinction between these two types of states is important because there are many senses in which entangled states are exactly the "useful" ones in quantum information theory.

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