The difficulty of simulating quantum systems, well known to quantum chemists, prompted the
idea of quantum computation. One can avoid the steep scaling associated with the exact …

Traditionally, entanglement was considered to be a quirk of microscopic objects that defied a
common-sense explanation. Now, however, entanglement is recognized to be ubiquitous …

Remarkable progress towards realizing quantum computation has been achieved using
natural and artificial atoms as qubits. This paper presents a brief overview of the current …

In a recent experiment, Barreiro et al (2011 Nature 470 486) demonstrated the fundamental
building blocks of an open-system quantum simulator with trapped ions. Using up to five …

Many techniques in quantum control rely on frequency separation as a means for
suppressing unwanted couplings. In its simplest form, the mechanism relies on the low …

We use NMR quantum simulators to study antiferromagnetic Ising spin chains undergoing
quantum phase transitions. Taking advantage of the sensitivity of the systems near criticality …

Quantum simulation can beat current classical computers with minimally a few tens of qubits.
Here we report an experimental demonstration that a small nuclear-magnetic-resonance …

We demonstrate coherent control of two nuclear spins mediated by the magnetic resonance
of a hyperfine-coupled electron spin. This control is used to create a double-nuclear …

It has been claimed that quantum computers can mimic quantum systems efficiently in the
polynomial scale. Traditionally, those simulations are carried out numerically on classical …

In this thesis we present new results relevant to two important problems in quantum
information science: the development of a theory of entanglement and the exploration of the …