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Exact and Approximate Performance of Concatenated Quantum Codes
Benjamin Rahn, Andrew C. Doherty, Hideo Mabuchi
We derive the effective channel for a logical qubit protected by an arbitrary quantum error-correcting code, and derive the map between channels induced by concatenation. For certa…
Distinguishing separable and entangled states
Andrew C. Doherty, Pablo A. Parrilo, Federico M. Spedalieri
We show how to design families of operational criteria that distinguish entangled from separable quantum states. The simplest of these tests corresponds to the well-known Peres-Hor…
Continuous quantum error correction via quantum feedback control
Charlene Ahn, Andrew C. Doherty, Andrew J. Landahl
We describe a protocol for continuously protecting unknown quantum states from decoherence that incorporates design principles from both quantum error correction and quantum feedba…
Robust control in the quantum domain
Andrew Doherty, John Doyle, Hideo Mabuchi +2
Recent progress in quantum physics has made it possible to perform experiments in which individual quantum systems are monitored and manipulated in real time. The advent of such ne…
Sensitivity optimization in quantum parameter estimation
F. Verstraete, A. C. Doherty, H. Mabuchi
We present a general framework for sensitivity optimization in quantum parameter estimation schemes based on continuous (indirect) observation of a dynamical system. As an illustra…