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- Canadian Institute for Theoretical AstrophysicsCA96 papers
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9 papers · 2 filters
Encoding a qubit into multilevel subspaces
Matthew Grace, Constantin Brif, Herschel Rabitz +3
We present a formalism for encoding the logical basis of a qubit into subspaces of multiple physical levels. The need for this multilevel encoding arises naturally in situations wh…
Robustness of multi-qubit entanglement in the independent decoherence model
Somshubhro Bandyopadhyay, Daniel A. Lidar
We study the robustness of the GHZ (or ``cat'') class of multi-partite states under decoherence. The noise model is described by a general completely positive map for qubits indepe…
Fault-Tolerant Quantum Dynamical Decoupling
K. Khodjasteh, D. A. Lidar
Dynamical decoupling pulse sequences have been used to extend coherence times in quantum systems ever since the discovery of the spin-echo effect. Here we introduce a method of rec…
Quantum Phase Transitions and Bipartite Entanglement
Lian-Ao Wu, Marcelo S. Sarandy, Daniel A. Lidar
We develop a general theory of the relation between quantum phase transitions (QPTs) characterized by nonanalyticities in the energy and bipartite entanglement. We derive a functio…
Fault-Tolerant Quantum Computation via Exchange interactions
M. Mohseni, D. A. Lidar
Quantum computation can be performed by encoding logical qubits into the states of two or more physical qubits, and controlling a single effective exchange interaction and possibly…
Adiabatic approximation in open quantum systems
M. S. Sarandy, D. A. Lidar
We generalize the standard quantum adiabatic approximation to the case of open quantum systems. We define the adiabatic limit of an open quantum system as the regime in which its d…