141 citations · 300 across the 12 of their papers we have counts for
12 papers
Qubit-channel metrology with very noisy initial states
David Collins
We consider an arbitrary qubit channel depending on a single parameter, which is to be estimated by a physical process. Using the quantum Fisher information per channel invocation…
Depolarizing channel parameter estimation using noisy initial states
David Collins, Jaimie Stephens
We consider estimating the parameter associated with the qubit depolarizing channel when the available initial states that might be employed are mixed. We use quantum Fisher inform…
Mixed state Pauli channel parameter estimation
David Collins
The accuracy of any physical scheme used to estimate the parameter describing the strength of a single qubit Pauli channel can be quantified using standard techniques from quantum…
Probing the qudit depolarizing channel
Michael Frey, David Collins, Karl Gerlach
For the quantum depolarizing channel with any finite dimension, we compare three schemes for channel identification: unentangled probes, probes maximally entangled with an external…
Discrimination of unitary transformations in the Deutsch-Jozsa algorithm
David Collins
We describe a general framework for regarding oracle-assisted quantum algorithms as tools for discriminating between unitary transformations. We apply this to the Deutsch-Jozsa pro…
Discrimination of Unitary Transformations and Quantum Algorithms
David Collins
Quantum algorithms are typically understood in terms of the evolution of a multi-qubit quantum system under a prescribed sequence of unitary transformations. The input to the algor…