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13 papers · 2 filters
Realization of quantum process tomography in NMR
Andrew M. Childs, Isaac L. Chuang, Debbie W. Leung
Quantum process tomography is a procedure by which the unknown dynamical evolution of an open quantum system can be fully experimentally characterized. We demonstrate explicitly ho…
Quantum Vernam Cipher
D. W. Leung
We discuss aspects of secure quantum communication by proposing and analyzing a quantum analog of the Vernam cipher (one-time-pad). The quantum Vernam cipher uses entanglement as t…
Hiding bits in Bell states
Barbara M. Terhal, David P. DiVincenzo, Debbie W. Leung
We present a scheme for hiding bits in Bell states that is secure even when the sharers Alice and Bob are allowed to carry out local quantum operations and classical communication.…
Nonadditivity of Bipartite Distillable Entanglement follows from Conjecture on Bound Entangled Werner States
Peter W. Shor, John A. Smolin, Barbara M. Terhal
Assuming the validity of a conjecture in quant-ph/9910026 and quant-ph/9910022 we show that the distillable entanglement for two bipartite states, each of which individually has ze…
The asymptotic entanglement cost of preparing a quantum state
Patrick M. Hayden, Michal Horodecki, Barbara M. Terhal
We give a detailed proof of the conjecture that the asymptotic entanglement cost of preparing a bipartite state ρis equal to the regularized entanglement of formation of ρ.
Universal simulation of Markovian quantum dynamics
Dave Bacon, Andrew M. Childs, Isaac L. Chuang +3
Although the conditions for performing arbitrary unitary operations to simulate the dynamics of a closed quantum system are well understood, the same is not true of the more genera…