Author
Ray Freeman
Other affiliations: Varian, Inc., Varian Associates, University of Oxford
Bio: Ray Freeman is an academic researcher from University of Cambridge. The author has contributed to research in topics: Pulse sequence & Fourier transform. The author has an hindex of 73, co-authored 269 publications receiving 22872 citations. Previous affiliations of Ray Freeman include Varian, Inc. & Varian Associates.
Papers published on a yearly basis
Papers
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1,806 citations
TL;DR: In this paper, the two-dimensional Fourier transform was applied to a sample of 9-hydroxytricyclodecan-2,5-dione.
1,203 citations
TL;DR: In this paper, the WALTZ-16 decoupling scheme was used for carbon-l 3 linewidth modulation with a 40% improvement in bandwidth over the original Waltz-16.
1,090 citations
TL;DR: In this paper, the effects of the proton irradiation sequence by means of a train of spin rotation operators, the overall effect at the end of the cycle being calculated by explicit matrix multiplication, the offset dependence of this proton response determined the residual splitting of the carbon-13 resonance and hence the effectiveness of the decoupling.
1,026 citations
TL;DR: In this paper, a family of new shaped radio-frequency pulses, known as BURP (band-selective, uniform response, pure-phase) pulses, has been created, which are of two classes: those that excite or invert z magnetization and those that act as general rotation πr/2 or π pulses irrespective of the initial condition of the nuclear magnetization.
776 citations
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01 Dec 2010
TL;DR: This chapter discusses quantum information theory, public-key cryptography and the RSA cryptosystem, and the proof of Lieb's theorem.
Abstract: Part I. Fundamental Concepts: 1. Introduction and overview 2. Introduction to quantum mechanics 3. Introduction to computer science Part II. Quantum Computation: 4. Quantum circuits 5. The quantum Fourier transform and its application 6. Quantum search algorithms 7. Quantum computers: physical realization Part III. Quantum Information: 8. Quantum noise and quantum operations 9. Distance measures for quantum information 10. Quantum error-correction 11. Entropy and information 12. Quantum information theory Appendices References Index.
14,825 citations
TL;DR: In this article, a new mixing scheme based on the MLEV-16 composite pulse decoupling cycle (II) was proposed, which is less sensitive to pulse imperfections and provides net magnetization transfer over a substantial bandwidth with only limited rf power.
3,552 citations
IBM1
TL;DR: In information processing, as in physics, the classical world view provides an incomplete approximation to an underlying quantum reality that can be harnessed to break codes, create unbreakable codes, and speed up otherwise intractable computations.
Abstract: In information processing, as in physics, our classical world view provides an incomplete approximation to an underlying quantum reality. Quantum effects like interference and entanglement play no direct role in conventional information processing, but they can--in principle now, but probably eventually in practice--be harnessed to break codes, create unbreakable codes, and speed up otherwise intractable computations.
3,080 citations
TL;DR: Two-dimensional correlated spectroscopy (COSY) is used for measurements of proton-proton spin-spin coupling constants in protein 1H NMR spectra.
2,999 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