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6 papers · 2 filters
Simulation and reversal of n-qubit Hamiltonians using Hadamard matrices
D. W. Leung
The ability to simulate one Hamiltonian with another is an important primitive in quantum information processing. In this paper, a simulation method for arbitrary …
Classical simulation of noninteracting-fermion quantum circuits
Barbara M. Terhal, David P. DiVincenzo
We show that a class of quantum computations that was recently shown to be efficiently simulatable on a classical computer by Valiant corresponds to a physical model of noninteract…
Enhanced Autocompensating Quantum Cryptography System
Donald S. Bethune, Martha Navarro, William P. Risk
We have improved the hardware and software of our autocompensating system for quantum key distribution by replacing bulk optical components at the end stations with fiber-optic equ…
More Is Not Necessarily Easier
Debbie W. Leung, John A. Smolin
In this brief comment, we consider the exact, deterministic, and nonasymptotic transformation of multiple copies of pure states under LOCC. It was conjectured in quant-ph/0103131 t…
Encoded Universality in Physical Implementations of a Quantum Computer
D. Bacon, J. Kempe, D. P. DiVincenzo +2
We revisit the question of universality in quantum computing and propose a new paradigm. Instead of forcing a physical system to enact a predetermined set of universal gates (e.g.,…
Detecting Quantum Entanglement
Barbara M. Terhal
We review the criteria for separability and quantum entanglement, both in a bipartite as well as a multipartite setting. We discuss Bell inequalities, entanglement witnesses, entro…