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11 papers · 2 filters
The Role of Rotational Invariance in the Properties of Hamiltonians
Alastair Kay
Is it possible to prove that the properties of Hamiltonians, such as the ground state energy, results of dynamical evolution, or thermal state expectation values, can be efficientl…
Fast, high fidelity information transmission through spin chain quantum wires
S. G. Schirmer, P. J. Pemberton-Ross
Spin chains have been proposed as quantum wires for information transfer in solid state quantum architectures. We show that huge gains in both transfer speed and fidelity are possi…
Implementation of Fault-tolerant Quantum Logic Gates via Optimal Control
R. Nigmatullin, S. G. Schirmer
The implementation of fault-tolerant quantum gates on encoded logic qubits is considered. It is shown that transversal implementation of logic gates based on simple geometric contr…
Entanglement generation between distant atoms by Lyapunov control
Xiaoting Wang, S. G. Schirmer
We show how to apply Lyapunov control design to the problem of entanglement creation between two atoms in distant cavities connected by optical fibers. The Lyapunov control design…
Does black-hole evaporation imply that physics is non-unitary, and if so, what must the laws of physics look like? An Essay
Steffen Gielen
Stephen Hawking's discovery of black hole evaporation had the remarkable consequence that information is destroyed by a black hole, which can only be accommodated by modifying the…
How long can a quantum memory withstand depolarizing noise?
Fernando Pastawski, Alastair Kay, Norbert Schuch +1
We investigate the possibilities and limitations of passive Hamiltonian protection of a quantum memory against depolarizing noise. Without protection, the lifetime of a single qubi…