scholarly journals Band-selective shaped pulse for high fidelity quantum control in diamond

2014 ◽  
Vol 104 (26) ◽  
pp. 262403 ◽  
Author(s):  
Yan-Chun Chang ◽  
Jian Xing ◽  
Fei-Hao Zhang ◽  
Gang-Qin Liu ◽  
Qian-Qing Jiang ◽  
...  
Keyword(s):  
Quantum Control ◽  
High Fidelity ◽  
Shaped Pulse

scholarly journals High-Fidelity Single-Shot Toffoli Gate via Quantum Control

2015 ◽  
Vol 114 (20) ◽  
Author(s):  
Ehsan Zahedinejad ◽  
Joydip Ghosh ◽  
Barry C. Sanders
Keyword(s):  
Quantum Control ◽  
High Fidelity ◽  
Single Shot ◽  
Toffoli Gate

scholarly journals Enhancing Quantum Control by Improving Shaped-Pulse Generation

2020 ◽  
Vol 13 (5) ◽  
Author(s):  
John P.S. Peterson ◽  
Roberto S. Sarthour ◽  
Raymond Laflamme
Keyword(s):  
Quantum Control ◽  
Pulse Generation ◽  
Shaped Pulse

scholarly journals Connection between Inverse Engineering and Optimal Control in Shortcuts to Adiabaticity

Entropy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 84
Author(s):  
Qi Zhang ◽  
Xi Chen ◽  
David Guéry-Odelin
Keyword(s):  
Optimal Control ◽  
Quantum Control ◽  
Cold Atoms ◽  
Spin Dynamics ◽  
Harmonic Trap ◽  
High Fidelity ◽  
Physical Constraints ◽  
Atomic Transport ◽  
Shortcuts To Adiabaticity ◽  
Very High

We consider fast high-fidelity quantum control by using a shortcut to adiabaticity (STA) technique and optimal control theory (OCT). Three specific examples, including expansion of cold atoms from the harmonic trap, atomic transport by moving harmonic trap, and spin dynamics in the presence of dissipation, are explicitly detailed. Using OCT as a qualitative guide, we demonstrate how STA protocols designed from inverse engineering method can approach with very high precision optimal solutions built about physical constraints, by a proper choice of the interpolation function and with a very reduced number of adjustable parameters.

scholarly journals Detuning-modulated composite pulses for high-fidelity robust quantum control

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
Elica Kyoseva ◽  
Hadar Greener ◽  
Haim Suchowski
Keyword(s):  
Quantum Control ◽  
High Fidelity ◽  
Composite Pulses

scholarly journals Generation of high-fidelity quantum control methods for multilevel systems

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
J. Randall ◽  
A. M. Lawrence ◽  
S. C. Webster ◽  
S. Weidt ◽  
N. V. Vitanov ◽  
...  
Keyword(s):  
Quantum Control ◽  
High Fidelity ◽  
Control Methods ◽  
Multilevel Systems

scholarly journals Robust Quantum Control by a Single-Shot Shaped Pulse

2013 ◽  
Vol 111 (5) ◽  
Author(s):  
D. Daems ◽  
A. Ruschhaupt ◽  
D. Sugny ◽  
S. Guérin
Keyword(s):  
Quantum Control ◽  
Single Shot ◽  
Shaped Pulse

QUANTUM CONTROL THEORY FOR DECOHERENCE SUPPRESSION IN QUANTUM GATES

2007 ◽  
Vol 05 (01n02) ◽  
pp. 207-213 ◽  
Author(s):  
T. CALARCO ◽  
M. A. CIRONE ◽  
M. COZZINI ◽  
A. NEGRETTI ◽  
A. RECATI ◽  
...  
Keyword(s):  
Control Theory ◽  
Quantum Control ◽  
Optical Lattices ◽  
Impulsive Control ◽  
Iterative Algorithms ◽  
Optimization Methods ◽  
Quantum Gates ◽  
High Fidelity ◽  
Atom Chips ◽  
Quantum Control Theory

We show how quantum optimal control theory can help achieve high-fidelity quantum gates in real experimental settings. We discuss several optimization methods (from iterative algorithms to optimization by interference and to impulsive control) and different physical scenarios (from optical lattices to atom chips and to Rydberg atoms).

scholarly journals Fast high-fidelity geometric quantum control with quantum brachistochrones

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Yang Dong ◽  
Ce Feng ◽  
Yu Zheng ◽  
Xiang-Dong Chen ◽  
Guang-Can Guo ◽  
...  
Keyword(s):  
Quantum Control ◽  
High Fidelity

scholarly journals Quantum control for high-fidelity multi-qubit gates

2018 ◽  
Vol 20 (11) ◽  
pp. 113009 ◽  
Author(s):  
Raymond J Spiteri ◽  
Marina Schmidt ◽  
Joydip Ghosh ◽  
Ehsan Zahedinejad ◽  
Barry C Sanders
Keyword(s):  
Quantum Control ◽  
High Fidelity

High-fidelity quantum control using ion crystals in a Penning trap

2009 ◽  
Vol 9 (11&12) ◽  
pp. 920-949
Author(s):  
M.J. Biercuk ◽  
H. Uys ◽  
A.P. VanDevender ◽  
N. Shiga ◽  
W.M. Itano ◽  
...  
Keyword(s):  
Quantum Information ◽  
Large Scale ◽  
Quantum Control ◽  
Penning Trap ◽  
Pulse Sequences ◽  
Coulomb Repulsion ◽  
High Fidelity ◽  
Effective Spin ◽  
Spin Flip ◽  
Spin Locking

We provide an introduction to the use of ion crystals in a Penning trap for experiments in quantum information. Macroscopic Penning traps allow for the containment of a few to a few million atomic ions whose internal states may be used in quantum information experiments. Ions are laser Doppler cooled, and the mutual Coulomb repulsion of the ions leads to the formation of crystalline arrays. The structure and dimensionality of the resulting ion crystals may be tuned using a combination of control laser beams and external potentials. We discuss the use of two-dimensional $^{9}$Be$^{+}$ ion crystals for experimental tests of quantum control techniques. Our primary qubit is the 124 GHz ground-state electron spin flip transition, which we drive using microwaves. An ion crystal represents a spatial ensemble of qubits, but the effects of inhomogeneities across a typical crystal are small, and as such we treat the ensemble as a single effective spin. We are able to initialize the qubits in a simple state and perform a projective measurement on the system. We demonstrate full control of the qubit Bloch vector, performing arbitrary high-fidelity rotations ($\tau_{\pi}\sim$200 $\mu$s). Randomized Benchmarking demonstrates an error per gate (a Pauli-randomized $\pi/2$ and $\pi$ pulse pair) of $8\pm1\times10^{-4}$. Ramsey interferometry and spin-locking measurements are used to elucidate the limits of qubit coherence in the system, yielding a typical free-induction decay coherence time of $T_{2}\sim$2 ms, and a limiting $T_{1\rho}\sim$688 ms. These experimental specifications make ion crystals in a Penning trap ideal candidates for novel experiments in quantum control. As such, we briefly describe recent efforts aimed at studying the error-suppressing capabilities of dynamical decoupling pulse sequences, demonstrating an ability to extend qubit coherence and suppress phase errors. We conclude with a discussion of future avenues for experimental exploration, including the use of additional nuclear-spin-flip transitions for effective multiqubit protocols, and the potential for Coulomb crystals to form a useful testbed for studies of large-scale entanglement.

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