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9 papers · 2 filters
A simple nearest-neighbor two-body Hamiltonian system for which the ground state is a universal resource for quantum computation
Stephen D. Bartlett, Terry Rudolph
We present a simple quantum many-body system - a two-dimensional lattice of qubits with a Hamiltonian composed of nearest-neighbor two-body interactions - such that the ground stat…
Reference frames, superselection rules, and quantum information
Stephen D. Bartlett, Terry Rudolph, Robert W. Spekkens
Recently, there has been much interest in a new kind of ``unspeakable'' quantum information that stands to regular quantum information in the same way that a direction in space or…
Quantum Control of a Single Qubit
Agata M. Branczyk, Paulo E. M. F. Mendonca, Alexei Gilchrist +2
Measurements in quantum mechanics cannot perfectly distinguish all states and necessarily disturb the measured system. We present and analyse a proposal to demonstrate fundamental…
Entanglement and Symmetry: A Case Study in Superselection Rules, Reference Frames, and Beyond
S. J. Jones, H. M. Wiseman, S. D. Bartlett +2
This paper concentrates on a particular example of a constraint imposed by superselection rules (SSRs): that which applies when the parties (Alice and Bob) cannot distinguish among…
Quantum mechanics as a consistency condition on initial and final boundary conditions
D. J. Miller
If the block universe view is correct, the future and the past have similar status and one would expect physical theories to involve final as well as initial boundary conditions. A…
Degradation of a quantum directional reference frame as a random walk
Stephen D. Bartlett, Terry Rudolph, Barry C. Sanders +1
We investigate if the degradation of a quantum directional reference frame through repeated use can be modeled as a classical direction undergoing a random walk on a sphere. We dem…