The quantum steering ellipsoid of a two-qubit state is the set of Bloch vectors that Bob can
collapse Alice's qubit to, considering all possible measurements on his qubit. We provide an …

The generalized amplitude-damping channel (GADC) is one of the sources of noise in
superconducting-circuit-based quantum computing. It can be viewed as the qubit analog of …

Quantum optical systems are typically affected by two types of noise: photon loss and
dephasing. Despite extensive research on each noise process individually, a …

The quantum marginal problem asks the question if elements of a given set of quantum
states can be reduced states of some joint quantum state. In this paper we present various …

Given two quantum channels, we examine the task of determining whether they are
compatible—meaning that one can perform both channels simultaneously but, in the future …

Entanglement, one of the central mysteries of quantum mechanics, plays an essential role in
numerous tasks of quantum information science. A natural question of both theoretical and …

The error threshold of a one-parameter family of quantum channels is defined as the largest
noise level such that the quantum capacity of the channel remains positive. This in turn …

Taking partial traces (PTrs) for computing reduced density matrices, or related functions, is a
ubiquitous procedure in the quantum mechanics of composite systems. In this paper, we …

One of the basic distinctions between classical and quantum mechanics is the existence of
fundamentally incompatible quantities. Such quantities are present on all levels of quantum …

We investigate the entanglement, CHSH nonlocality, fully entangled fraction, and symmetric
extendibility of two-qubit states that have a single maximally mixed marginal. Within this set …