



@article {1249,
	title = {Realization of quantum process tomography in NMR},
	journal = {Physical Review A},
	volume = {64},
	year = {2001},
	month = {2001/6/13},
	abstract = {  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 how this procedure can be implemented with a nuclear
magnetic resonance quantum computer. This allows us to measure the fidelity of
a controlled-not logic gate and to experimentally investigate the error model
for our computer. Based on the latter analysis, we test an important assumption
underlying nearly all models of quantum error correction, the independence of
errors on different qubits.
},
	doi = {10.1103/PhysRevA.64.012314},
	url = {http://arxiv.org/abs/quant-ph/0012032v1},
	author = {Andrew M. Childs and Isaac L. Chuang and Debbie W. Leung}
}
@article {1260,
	title = {Universal simulation of Markovian quantum dynamics},
	journal = {Physical Review A},
	volume = {64},
	year = {2001},
	month = {2001/11/9},
	abstract = {  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 general class of quantum operations (also known as
superoperators) corresponding to the dynamics of open quantum systems. We
propose a framework for the generation of Markovian quantum dynamics and study
the resources needed for universality. For the case of a single qubit, we show
that a single nonunitary process is necessary and sufficient to generate all
unital Markovian quantum dynamics, whereas a set of processes parametrized by
one continuous parameter is needed in general. We also obtain preliminary
results for the unital case in higher dimensions.
},
	doi = {10.1103/PhysRevA.64.062302},
	url = {http://arxiv.org/abs/quant-ph/0008070v2},
	author = {Dave Bacon and Andrew M. Childs and Isaac L. Chuang and Julia Kempe and Debbie W. Leung and Xinlan Zhou}
}
@article {1207,
	title = {Universal quantum computation with two-level trapped ions},
	journal = {Physical Review A},
	volume = {63},
	year = {2000},
	month = {2000/12/11},
	abstract = {  Although the initial proposal for ion trap quantum computation made use of an
auxiliary internal level to perform logic between ions, this resource is not
necessary in principle. Instead, one may perform such operations directly using
sideband laser pulses, operating with an arbitrary (sufficiently small)
Lamb-Dicke parameter. We explore the potential of this technique, showing how
to perform logical operations between the internal state of an ion and the
collective motional state and giving explicit constructions for a
controlled-not gate between ions.
},
	doi = {10.1103/PhysRevA.63.012306},
	url = {http://arxiv.org/abs/quant-ph/0008065v1},
	author = {Andrew M. Childs and Isaac L. Chuang}
}
