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8 papers · 2 filters
The Propagation of Quantum Information Through a Spin System
Tobias J. Osborne, Noah Linden
It has been recently suggested that the dynamics of a quantum spin system may provide a natural mechanism for transporting quantum information. We show that one dimensional rings o…
Statics and Dynamics of Quantum XY and Heisenberg Systems on Graphs
Tobias J. Osborne
We consider the statics and dynamics of distinguishable spin-1/2 systems on an arbitrary graph G with N vertices. In particular, we consider systems of quantum spins evolving accor…
Multiplicativity of Accessible Fidelity and Quantumness for Sets of Quantum States
K. M. R. Audenaert, C. A. Fuchs, C. King +1
Two measures of sensitivity to eavesdropping for alphabets of quantum states were recently introduced by Fuchs and Sasaki in quant-ph/0302092. These are the accessible fidelity and…
Relating quantum privacy and quantum coherence: an operational approach
Igor Devetak, Andreas Winter
We describe how to achieve optimal entanglement generation and one-way entanglement distillation rates by coherent implementation of a class of secret key generation and secret key…
Randomizing quantum states: Constructions and applications
Patrick Hayden, Debbie Leung, Peter W. Shor +1
The construction of a perfectly secure private quantum channel in dimension d is known to require 2 log d shared random key bits between the sender and receiver. We show that if on…
Distillation of secret key and entanglement from quantum states
Igor Devetak, Andreas Winter
We study and solve the problem of distilling secret key from quantum states representing correlation between two parties (Alice and Bob) and an eavesdropper (Eve) via one-way publi…