首页/论文/quant-ph/0105147

arXiv quant-ph/01051472001-05-30quant-ph

Non-thermal nuclear magnetic resonance quantum computing using hyperpolarized Xenon

Anne S. Verhulst, Oskar Liivak, Mark H. Sherwood, Hans-Martin Vieth, Isaac L. Chuang

备注：: 4 pages, 3 figures. Submitted for publication
发表信息：: Appl. Phys. Lett 79, 2480 (2001) -- minor changes
DOI：: 10.1063/1.1409279

英文摘要：

Current experiments in liquid-state nuclear magnetic resonance quantum computing are limited by low initial polarization. To address this problem, we have investigated the use of optical pumping techniques to enhance the polarization of a 2-qubit NMR quantum computer (13C and 1H in 13CHCl3). To efficiently use the increased polarization, we have generalized the procedure for effective pure state preparation. With this new, more flexible scheme, an effective pure state was prepared with polarization-enhancement of a factor of 10 compared to the thermal state. An implementation of Grover's quantum search algorithm was demonstrated using this new technique.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

阅读原文

阅读 PDF ↗

arXiv 页面 ↗HTML 原文 ↗

本文内容

英文摘要相关论文

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

继续探索

相关论文

NMR Quantum Computation with a hyperpolarized nuclear spin bulk

We consider two new quantum gate mechanisms based on nuclear spins in hyperpolarized solid $^{129}Xe$ and HCl mixtures and inorganic semiconductors. We propose two schemes for implementing a controlled NOT (CNOT) gate based on nuclear magnetic resonance (NMR) spectroscopy and magnetic resonance imaging (MRI) from hyperpolarized solid $^{129}Xe$ and HCl mixtures and optically pumped NMR in semiconductors. Such gates might be built up with particular spins addressable based on MRI techniques and optical pumping and optical detection techniques. The schemes could be useful for implementing actual…

1998-11-19quant-ph

超极化分子核自旋实现磁放大

Hyperpolarized Molecular Nuclear Spins Achieve Magnetic Amplification

针对核自旋磁传感响应度低的问题，本研究提出基于超极化分子核自旋的磁放大方法，实现了较现有质子、Overhauser磁力仪数个量级的响应度提升，为新型量子传感器研发提供支撑。

2025-11-14quant-ph

Long-lived state in a four-spin system hyperpolarized at room temperature

A solution with hyperpolarized nuclear spins encoded into a long-lived state has been utilized for sensing chemical phenomena. In a conventional way, nuclear spins are hyperpolarized at very low temperatures. In this work, we demonstrate the encoding of a four-nuclear-spin system hyperpolarized at room temperature into a long-lived state in a solution. We apply the solution with the long-lived state as a sensor in ligand--receptor binding experiments.

2019-08-23physics.chem-phquant-ph

Optical hyperpolarization of heteronuclear spin singlet order in liquids

The nuclear spin singlet order involving coupled pairs of spins-1/2 may be used to store nuclear spin hyperpolarization in a room temperature liquid for a time much longer than the spin-lattice relaxation time $T_1$. There both are observations of long-lived homonuclear and heteronuclear spin-singlet order. Although hyperpolarized singlet order of the same species are accessible, hyperpolarized heteronuclear spin-singlet order has not been presented yet. Here we show hyperpolarized singlet order is achievable in the sample of $^{13}$C-labeled formic acid solution at room temperature by using o…

2021-06-01quant-ph

High-Field Magnetometry with Hyperpolarized Nuclear Spins

Quantum sensors have attracted broad interest in the quest towards sub-micronscale NMR spectroscopy. Such sensors predominantly operate at low magnetic fields. Instead, however, for high resolution spectroscopy, the high-field regime is naturally advantageous because it allows high absolute chemical shift discrimination. Here we propose and demonstrate a high-field spin magnetometer constructed from an ensemble of hyperpolarized ${}^{13}C$ nuclear spins in diamond. The ${}^{13}C$ nuclei are initialized via Nitrogen Vacancy (NV) centers and protected along a transverse Bloch sphere axis for min…

2021-12-22cond-mat.mes-hallphysics.chem-phquant-ph

溶液中直接可观测的Zeeman不敏感核自旋相干性

Dynamics of hyperpolarized nuclear spins at Zeeman-insensitive points

IBEC – Institute for Bioengineering of Catalonia（加泰罗尼亚生物工程学院研究所）；Institute of Biological Information Processing, Structural Biochemistry (IBI-7), Forschungszentrum Jülich（于利希研究中心生物信息处理与结构生物化学研究所）；Institute of Technical and Macromolecular Chemistry, RWTH Aachen University（亚琛工业大学技术与高分子化学研究所）；DWI – Leibniz-Institute for Interactive Materials（莱布尼兹交互材料研究所）；ICFO—Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology（巴塞罗那科学技术学院光子科学研究所）；Department of Electrical and Computer Engineering, Isfahan University of Technology（伊斯法罕理工大学电气与计算机工程系）；ICREA – Institució Catalana de Recerca i Estudis Avançats（加泰罗尼亚高级研究与教育学院）

本研究在极低磁场下实现了溶液中长寿命、直接可观测的核自旋相干性，通过三自旋跃迁展示对磁场扰动的不敏感性及较长的相干寿命。

2026-08-13physics.chem-phquant-ph

更多相关论文收起更多论文

Hyperpolarized relaxometry based nuclear T1 noise spectroscopy in hybrid diamond quantum registers

Understanding the origins of spin lifetimes in hybrid quantum systems is a matter of current importance in several areas of quantum information and sensing. Methods that spectrally map spin relaxation processes provide insight into their origin and can motivate methods to mitigate them. In this paper, using a combination of hyperpolarization and precision field cycling over a wide range (1mT-7T), we map frequency dependent relaxation in a prototypical hybrid system of 13C nuclear spins in diamond coupled to Nitrogen Vacancy centers. Nuclear hyperpolarization through the optically pumped NV ele…

2019-02-17cond-mat.mes-hallquant-ph

Optically detected NMR of optically hyperpolarized 31P neutral donors in 28Si

The electron and nuclear spins of the shallow donor 31P are promising qubit candidates invoked in many proposed Si-based quantum computing schemes. We have recently shown that the near-elimination of inhomogeneous broadening in highly isotopically enriched 28Si enables an optical readout of both the donor electron and nuclear spins by resolving the donor hyperfine splitting in the near-gap donor bound exciton transitions. We have also shown that pumping these same transitions can very quickly produce large electron and nuclear hyperpolarizations at low magnetic fields, where the equilibrium el…

2011-06-01cond-mat.otherphysics.atom-phquant-ph

Tailored nanodiamonds for hyperpolarized 13C MRI

Nanodiamond is poised to become an attractive material for hyperpolarized 13C MRI if large nuclear polarizations can be achieved without the accompanying rapid spin-relaxation driven by paramagnetic species. Here we report enhanced and long-lived 13C polarization in synthetic nanodiamonds tailored by acid-cleaning and air-oxidation protocols. Our results separate the contributions of different paramagnetic species on the polarization behavior, identifying the importance of substitutional nitrogen defect centers in the nanodiamond core. These results are likely of use in the development of nano…

2019-09-11cond-mat.mes-hallphysics.med-phquant-ph

Inductive measurement of optically hyperpolarized phosphorous donor nuclei in an isotopically-enriched silicon-28 crystal

We experimentally demonstrate the inductive readout of optically hyperpolarized phosphorus-31 donor nuclear spins in an isotopically enriched silicon-28 crystal. The concentration of phosphorus donors in the crystal was 1.5 x 10$^{15}$ cm$^{-3}$, three orders of magnitude lower than has previously been detected via direct inductive detection. The signal-to-noise ratio measured in a single free induction decay from a 1 cm$^3$ sample ($\approx 10^{15}$ spins) was 113. By transferring the sample to an X-band ESR spectrometer, we were able to obtain a lower bound for the nuclear spin polarization …

2014-12-12cond-mat.mtrl-sciquant-ph

NMR study of optically hyperpolarized phosphorus donor nuclei in silicon

We use above-bandgap optical excitation, via a 1047 nm laser, to hyperpolarize the $^{31}$P spins in low-doped (N$_D =6\times10^{15}$ cm$^{-3}$) natural abundance silicon at 4.2 K and 6.7 T, and inductively detect the resulting NMR signal. The $30$ kHz spectral linewidth observed is dramatically larger than the 600 Hz linewidth observed from a $^{28}$Si-enriched silicon crystal. We show that the observed broadening is consistent with previous ENDOR results showing discrete isotope mass effect contributions to the donor hyperfine coupling. A secondary source of broadening is likely due to varia…

2018-07-23cond-mat.mes-hallquant-ph

仲氢超极化动力学的实时磁观测

Live magnetic observation of parahydrogen hyperpolarization dynamics

本文提出用亚皮特斯拉灵敏度的原子磁力计对超极化材料进行实时、非破坏性磁观测，揭示了仲氢诱导自旋动力学及化学交换驱动的丙酮酸超极化过程，为超极化化合物的产生与输运研究提供了新手段。

2024-12-30physics.chem-phquant-ph

光超极化材料用于悬浮光学机械学

Optically Hyperpolarized Materials for Levitated Optomechanics

研究利用悬浮的含非永久性可控电子自旋的固体，通过超长寿命超极化核自旋环境，用于物质波干涉仪和新型NMR技术。设计了多自旋 Stern-Gerlach 类干涉协议，避免了固态晶体中电子自旋缺陷的限制，并分析了魔角旋转和自旋团块极化测量方法。

2025-11-28cond-mat.mes-hallquant-ph

Dynamical decoupling in interacting systems: applications to signal-enhanced hyperpolarized readout

Methods that preserve coherence broadly impact all quantum information processing and metrology applications. Dynamical decoupling methods accomplish this by protecting qubits in noisy environments but are typically constrained to the limit where the qubits themselves are non-interacting. Here we consider the alternate regime wherein the inter-qubit couplings are of the same order as dephasing interactions with the environment. We propose and demonstrate a multi-pulse protocol that protects transverse spin states by suitably Hamiltonian engineering the inter-spin coupling while simultaneously …

2020-08-19cond-mat.mes-hallquant-ph

Optical polarization of nuclear spins in silicon carbide

We demonstrate optically pumped dynamic nuclear polarization of 29-Si nuclear spins that are strongly coupled to paramagnetic color centers in 4H- and 6H-SiC. The 99 +/- 1% degree of polarization at room temperature corresponds to an effective nuclear temperature of 5 microKelvin. By combining ab initio theory with the experimental identification of the color centers' optically excited states, we quantitatively model how the polarization derives from hyperfine-mediated level anticrossings. These results lay a foundation for SiC-based quantum memories, nuclear gyroscopes, and hyperpolarized pro…

2015-02-26cond-mat.mes-hallcond-mat.mtrl-sciquant-ph

Universal Long-time Behavior of Nuclear Spin Decays in a Solid

Magnetic resonance studies of nuclear spins in solids are exceptionally well suited to probe the limits of statistical physics. We report experimental results indicating that isolated macroscopic systems of interacting nuclear spins possess the following fundamental property: spin decays that start from different initial configurations quickly evolve towards the same long-time behavior. This long-time behavior is characterized by the shortest ballistic microscopic timescale of the system and therefore falls outside of the validity range for conventional approximations of statistical physics. W…

2008-05-13cond-mat.stat-mechnlin.CDquant-ph

Decoupling of Spin Decoherence Paths near Zero Magnetic Field

We demonstrate a method to quantify and manipulate nuclear spin decoherence mechanisms that are active in zero to ultralow magnetic fields. These include: (i) non-adiabatic switching of spin quantization axis, due to residual background fields; (ii) scalar pathways due to through-bond couplings between $^1$H and heteronuclear spin species, such as $^2$H used partially as an isotopic substitute for $^1$H. Under conditions of free evolution, scalar relaxation due to $^2$H can significantly limit nuclear spin polarization lifetimes and thus the scope of magnetic resonance procedures near zero fie…

2021-12-16physics.chem-phquant-ph

核自旋扩散在晶态纳米硅颗粒动态核极化中的作用

The role of nuclear spin diffusion in dynamic nuclear polarization of crystalline nanoscale silicon particles

本研究通过第一性原理计算和有限元模拟，发现晶态纳米硅颗粒的超极化增强和弛豫时间与尺寸无关，并揭示了超极化输运机制，为其他材料的自旋扩散研究提供了可调模拟方法。

2024-12-13cond-mat.mtrl-sciquant-ph

Optical hyperpolarization of 13C nuclear spins in nanodiamond ensembles

Here we propose and analyse in detail protocols that can achieve rapid hyperpolarization of 13C nuclear spins in randomly oriented ensembles of nanodiamonds at room temperature. Our protocols exploit a combination of optical polarization of electron spins in nitrogen-vacancy centers and the transfer of this polarization to 13C nuclei by means of microwave control to overcome the severe challenges that are posed by the random orientation of the nanodiamonds and their nitrogen-vacancy centers. Specifically, these random orientations result in exceedingly large energy variations of the electron s…

2015-04-09cond-mat.mes-hallquant-ph