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Ion-trap quantum logic using long-wavelength radiation.
A quantum information processor is proposed that combines experimental techniques and technology successfully demonstrated either in nuclear magnetic resonance experiments or with trapped ions to permit one to individually address and coherently manipulate ions confined in an electrodynamic trap using radiation in the radiofrequency or microwave regime.
Decoherence and multipartite entanglement.
A suitable generalization of concurrence reveals distinct scaling of the entanglement decay rate of Greenberger-Horne-Zeilinger and W states, for various environments.
Essential entanglement for atomic and molecular physics
Entanglement is nowadays considered as a key quantity for the understanding of correlations, transport properties and phase transitions in composite quantum systems, and thus receives interest beyond
The Bravyi-Kitaev transformation: Properties and applications
Quantum chemistry is an important area of application for quantum computation. In particular, quantum algorithms applied to the electronic structure problem promise exact, efficient methods for
Smooth Optimal Quantum Control for Robust Solid-State Spin Magnetometry.
We experimentally demonstrate a simple yet versatile optimal quantum control technique that achieves tailored robustness against qubit inhomogeneities and control errors while requiring minimal
Resilient Entangling Gates for Trapped Ions.
This work experimentally demonstrates how a new type of Mølmer-Sørensen gate protects against infidelity caused by heating of the motional mode used during the gate, and shows how the same technique simultaneously provides significant protection against slow fluctuations and mis-sets in the secular frequency.
Decondensation in Nonequilibrium Photonic Condensates: When Less Is More.
A rich nonequilibrium phase diagram is presented which exhibits transitions between these phases, including decondensation of individual modes under conditions that would typically favor condensation.
Concurrence via entanglement witnesses
We derive an experimentally observable lower bound on concurrence of mixed quantum states in terms of an entanglement witness, relating measurements on single states with those on two copies.
Accurate effective Hamiltonians via unitary flow in Floquet space.
This work presents a systematic construction of effective Hamiltonians of periodically driven quantum systems and explains the experimentally observed deviation of expected suppressed tunneling in ultracold atoms.