Questions tagged [quantum-channel]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
0 answers
56 views

what is Pauli twirling approximation?

In this video, Artur Ekert shows that for a single qubit, 4 Kraus operators can be chosen such that the action on state $\rho$ is given as $\rho \rightarrow \sum_m p_m A_m \rho A_m^\dagger$. We can ...
1 vote
1 answer
57 views

Cirq: Getting The Instances (samples) of a Quantum Circuit with Probabilistic Unitaries or Mixtures

The wavefunction simulator in Cirq uses a Monte Carlo approach to simulate a certain subset of quantum noise channels, namely through probabilistic/stochastic application of unitary gates. These are ...
2 votes
1 answer
129 views

Additivity of degradable and anti-degradable quantum capacities

It is known that for degradable channels $\mathcal{N}$ and $\mathcal{M}$, the single-letter quantum capacity is aditive (Potential Capacities of Quantum Channels), i.e. \begin{equation} Q^{(1)}(\...