Exploring the limits of broadband 90° and 180° universal rotation pulses.
TL;DR: A systematic study characterizing the achievable performance of 90° and 180° universal rotation pulses as functions of bandwidth, pulse length, and tolerance to B(1)-field inhomogeneity/miscalibration finds that the application of a single optimal refocusing pulse matches or improves the performance of two consecutive inversion pulses in INEPT-like pulse sequence elements of the same total duration.
About: This article is published in Journal of Magnetic Resonance.The article was published on 2012-12-01. It has received 109 citations till now. The article focuses on the topics: Bandwidth-limited pulse & Frequency-resolved optical gating.
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TL;DR: In this communication, state-of-the-art quantum control techniques are reviewed and put into perspective by a consortium of experts in optimal control theory and applications to spectroscopy, imaging, as well as quantum dynamics of closed and open systems.
Abstract: It is control that turns scientific knowledge into useful technology: in physics and engineering it provides a systematic way for driving a dynamical system from a given initial state into a desired target state with minimized expenditure of energy and resources As one of the cornerstones for enabling quantum technologies, optimal quantum control keeps evolving and expanding into areas as diverse as quantum-enhanced sensing, manipulation of single spins, photons, or atoms, optical spectroscopy, photochemistry, magnetic resonance (spectroscopy as well as medical imaging), quantum information processing and quantum simulation In this communication, state-of-the-art quantum control techniques are reviewed and put into perspective by a consortium of experts in optimal control theory and applications to spectroscopy, imaging, as well as quantum dynamics of closed and open systems We address key challenges and sketch a roadmap for future developments
572 citations
Cites background or methods from "Exploring the limits of broadband 9..."
...t bandwidth (range of detunings) and robustness with respect to scaling of the control amplitude (width of B 1 inhomogeneity distribution) of optimized PP [218, 219] and UR pulses have been performed [216]for experiments where the maximum control amplitudes (e.g. in many applications of NMR or ESR spectroscopy) or the pulse energy (e.g. in MRI) are experimentally limiting factors. For a desired fi- deli...
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...e and exact controllability results have been obtained recently in this direction [28, 249, 251]. This analysis is important for designing control fields which are robust to experimental imperfections [144, 216, 218, 219, 379, 420]. In addition to experimental imperfections and fluctuations, decoherence may pose an obstacle to control. For open quantum systems, the control field usually cannot fully compensate dissipation, as rig...
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TL;DR: In this paper, state-of-the-art quantum control techniques are reviewed and put into perspective by a consortium uniting expertise in optimal control theory and applications to spectroscopy, imaging, quantum dynamics of closed and open systems.
Abstract: It is control that turns scientific knowledge into useful technology: in physics and engineering it provides a systematic way for driving a system from a given initial state into a desired target state with minimized expenditure of energy and resources -- as famously applied in the Apollo programme. As one of the cornerstones for enabling quantum technologies, optimal quantum control keeps evolving and expanding into areas as diverse as quantum-enhanced sensing, manipulation of single spins, photons, or atoms, optical spectroscopy, photochemistry, magnetic resonance (spectroscopy as well as medical imaging), quantum information processing and quantum simulation. --- Here state-of-the-art quantum control techniques are reviewed and put into perspective by a consortium uniting expertise in optimal control theory and applications to spectroscopy, imaging, quantum dynamics of closed and open systems. We address key challenges and sketch a roadmap to future developments.
381 citations
TL;DR: The concept of the validation cross is introduced, which helps to categorize experiments according to their information content and to simplify the choice of the right experiment in order to address a specific question.
114 citations
TL;DR: A novel NMR experiment, the so-called ASAP-HSQC, is introduced that allows the detection of heteronuclear one-bond correlations in less than 30 s on small molecules at natural abundance without compromises in sweep width, resolution or spectral quality.
Abstract: A novel NMR experiment, the so-called ASAP-HSQC, is introduced that allows the detection of heteronuclear one-bond correlations in less than 30 s on small molecules at natural abundance without compromises in sweep width, resolution or spectral quality. Equally, the experiment allows a significant increase in digital resolution or a moderate senstitivity enhancement in the same overall experiment time compared to a conventional HSQC. The gain is a consequence of keeping all unused proton magnetization along z during acquisition, so that the previously reported ASAP and ALSOFAST approaches can be transferred from HMQC to HSQC-type experiments. Next to basic and broadband pulse sequences, a characterization of the sequence with respect to minimum measurement time, sensitivity gain, and advantages in resolution compared to state-of-the-art experiments is given.
83 citations
TL;DR: In this article, the authors introduce the concept of systematically designing polarization sequences by Hamiltonian engineering, resulting in polarization sequences that are robust and fast, and theoretically derive sequences and experimentally demonstrate that they are capable of efficient polarization transfer from optically polarized nitrogen-vacancy (NV) centers in diamond to the surrounding 13C nuclear spin bath even in the presence of control errors.
Abstract: Dynamic nuclear polarization (DNP) is an important technique that uses polarization transfer from electron to nuclear spins to achieve nuclear hyperpolarization. Combining efficient DNP with optically polarized nitrogen-vacancy (NV) centers offers promising opportunities for novel technological applications, including nanoscale nuclear magnetic resonance spectroscopy of liquids, hyperpolarized nanodiamonds as magnetic resonance imaging contrast agents, and the initialization of nuclear spin–based diamond quantum simulators. However, none of the current realizations of polarization transfer are simultaneously robust and sufficiently efficient, making the realization of the applications extremely challenging. We introduce the concept of systematically designing polarization sequences by Hamiltonian engineering, resulting in polarization sequences that are robust and fast. We theoretically derive sequences and experimentally demonstrate that they are capable of efficient polarization transfer from optically polarized NV centers in diamond to the surrounding 13C nuclear spin bath even in the presence of control errors, making the abovementioned novel applications possible.
83 citations
References
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Book•
01 Jan 1987
TL;DR: In this paper, the dynamics of nuclear spin systems were studied by two-dimensional exchange spectroscopy and nuclear magnetic resonance imaging (NEMI) imaging, and two different correlation methods based on coherence transfer were proposed.
Abstract: List of notation Introduction The dynamics of nuclear spin systems Manipulation of nuclear spin Hamiltonians One-dimensional Fourier spectroscopy Multiple-quantum transitions Two-dimensional Fourier spectroscopy Two-dimensional separation of interactions Two-dimensional correlation methods based on coherence transfer Dynamic processes studied by two-dimensional exchange spectroscopy Nuclear magnetic resonance imaging References Index.
4,977 citations
TL;DR: In this article, the possibilities for the extension of spectroscopy to two dimensions are discussed, including the elucidation of energy level diagrams, the observation of multiple quantum transitions, and the recording of high-resolution spectra in inhomogenous magnetic fields.
Abstract: The possibilities for the extension of spectroscopy to two dimensions are discussed. Applications to nuclear magnetic resonance are described. The basic theory of two‐dimensional spectroscopy is developed. Numerous possible applications are mentioned and some of them treated in detail, including the elucidation of energy level diagrams, the observation of multiple quantum transitions, and the recording of high‐resolution spectra in inhomogenous magnetic fields. Experimental results are presented for some simple spin systems.
2,968 citations
2,189 citations
1,695 citations