



@article {2412,
	title = {Two-qubit entangling gates within arbitrarily long chains of trapped ions},
	year = {2019},
	month = {05/28/2019},
	abstract = {<p>Ion trap systems are a leading platform for large scale quantum computers. Trapped ion qubit crystals are fully-connected and reconfigurable, owing to their long range Coulomb interaction that can be modulated with external optical forces. However, the spectral crowding of collective motional modes could pose a challenge to the control of such interactions for large numbers of qubits. Here, we show that high-fidelity quantum gate operations are still possible with very large trapped ion crystals, simplifying the scaling of ion trap quantum computers. To this end, we present analytical work that determines how parallel entangling gates produce a crosstalk error that falls off as the inverse cube of the distance between the pairs. We also show experimental work demonstrating entangling gates on a fully-connected chain of seventeen 171Yb+ ions with fidelities as high as 97(1)\%.</p>},
	url = {https://arxiv.org/abs/1905.10421},
	author = {Kevin A. Landsman and Yukai Wu and Pak Hong Leung and Daiwei Zhu and Norbert M. Linke and Kenneth R. Brown and Luming Duan and Christopher R. Monroe}
}
@article {1486,
	title = {Individual Addressing in Quantum Computation through Spatial Refocusing},
	journal = {Physical Review A},
	volume = {88},
	year = {2013},
	month = {2013/11/21},
	abstract = {  Separate addressing of individual qubits is a challenging requirement for
scalable quantum computation, and crosstalk between operations on neighboring
qubits remains as a significant source of noise for current experimental
implementation of multi-qubit platforms. We propose a scheme based on spatial
refocusing from interference of several coherent laser beams to significantly
reduce the crosstalk noise for any type of quantum gates. A general framework
is developed for the spatial refocusing technique, in particular with practical
Gaussian beams, and we show under typical experimental conditions, the
crosstalk-induced infidelity of quantum gates can be reduced by several orders
of magnitude with a moderate cost of a few correction laser beams.
},
	doi = {10.1103/PhysRevA.88.052325},
	url = {http://arxiv.org/abs/1305.2798v3},
	author = {Chao Shen and Zhe-Xuan Gong and Luming Duan}
}
@article {1492,
	title = {Quantum Simulation of Spin Models on an Arbitrary Lattice with Trapped  Ions
},
	journal = {New Journal of Physics},
	volume = {14},
	year = {2012},
	month = {2012/09/27},
	pages = {095024},
	abstract = {  A collection of trapped atomic ions represents one of the most attractive
platforms for the quantum simulation of interacting spin networks and quantum
magnetism. Spin-dependent optical dipole forces applied to an ion crystal
create long-range effective spin-spin interactions and allow the simulation of
spin Hamiltonians that possess nontrivial phases and dynamics. Here we show how
appropriate design of laser fields can provide for arbitrary multidimensional
spin-spin interaction graphs even for the case of a linear spatial array of
ions. This scheme uses currently existing trap technology and is scalable to
levels where classical methods of simulation are intractable.
},
	doi = {10.1088/1367-2630/14/9/095024},
	url = {http://arxiv.org/abs/1201.0776v1},
	author = {Simcha Korenblit and Dvir Kafri and Wess C. Campbell and Rajibul Islam and Emily E. Edwards and Zhe-Xuan Gong and Guin-Dar Lin and Luming Duan and Jungsang Kim and Kihwan Kim and Christopher Monroe}
}
