Vladimir G. Plekhanov
This paper is brief review of three aspects of the isotope - based quantum information: computation, teleportation and cryptography. Our results demonstrate not only that entanglement exists in elementary excitation of isotope - mixed solids but also it can be used for quantum information processing.
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The protection of the coherence of open quantum systems against the influence of their environment is a very topical issue. A scheme is proposed here which protects a general quantum system from the action of a set of arbitrary uncontrolled unitary evolutions. This method draws its inspiration from ideas of standard error-correction (ancilla adding, coding and decoding) and the Quantum Zeno Effect. A pedagogical demonstration of our method on a simple atomic system, namely a Rubidium isotope, is proposed.
Some of the stable isotopes of silicon and carbon have zero nuclear spin, whereas many of the other elements that constitute semiconductors consist entirely of stable isotopes that have nuclear spins. Silicon and diamond crystals composed of nuclear-spin-free stable isotopes (Si-28, Si-30, or C-12) are considered to be ideal host matrixes to place spin quantum bits (qubits) for quntum computing and sensing applications because their coherent properties are not disrupted thanks to the absence of host nuclear spins. The present article describes the state-of-the-art and future perspective of sil…
Quantum Filtering of Hydrogen Isotopes through Graphene
本研究提出利用石墨烯层进行量子过滤，实现高效且经济可行的氢同位素分离，通过计算隧穿和粘附概率，证明该方法可有效富集氘。
Giant Isotope Effect on the Excited-State Lifetime and Emission Efficiency of the Silicon T Centre
本研究通过第一性原理计算发现，硅中氘代T中心因碳-氢局域振动模式能量降低而抑制非辐射衰变，使其激发态寿命比氢代变体长五倍以上，接近单位量子效率，从而提升单光子源、量子存储器和纠缠生成的效率。
In this paper, we present a realistic application of the coherence protection method proposed in the previous article. A qubit of information encoded on the two spin states of a Rubidium isotope is protected from the action of electric and magnetic fields.
One possible explanation for magnetosensing in biology, such as avian magnetoreception, is based on the spin dynamics of certain chemical reactions that involve radical pairs. Radical pairs have been suggested to also play a role in anesthesia, hyperactivity, neurogenesis, circadian clock rhythm, microtubule assembly, etc. It thus seems critical to probe the credibility of such models. One way to do so is through isotope effects with different nuclear spins. Here we briefly review the papers involving spin-related isotope effects in biology. We suggest studying isotope effects can be an intere…
Quantum and classical analyses of intertwined phase transitions in odd-mass Nb isotopes
研究通过量子和经典分析揭示奇数质量铌同位素中交织的量子相变特性及单粒子运动的影响。
Path integral implementation of the quantum instanton approximation currently belongs among the most accurate methods for computing quantum rate constants and kinetic isotope effects, but its use has been limited due to the rather high computational cost. Here we demonstrate that the efficiency of quantum instanton calculations of the kinetic isotope effects can be increased by orders of magnitude by combining two approaches: The convergence to the quantum limit is accelerated by employing high-order path integral factorizations of the Boltzmann operator, while the statistical convergence is i…
Quantum entanglement is crucial for simulating and understanding exotic physics of strongly correlated many-body systems, such as high--temperature superconductors, or fractional quantum Hall states. The entanglement of non-identical particles exhibits richer physics of strong many-body correlations and offers more opportunities for quantum computation, especially with neutral atoms where in contrast to ions the interparticle interaction is widely tunable by Feshbach resonances. Moreover, the inter-species entanglement forms a basis for the properties of various compound systems, ranging from …
Nitrogen isotope effects on boron vacancy quantum sensors in hexagonal boron nitride
本文研究$^{15}$N同位素富集hBN中硼空位缺陷的磁共振特性，测得$^{15}$N自旋超精细相互作用参数为64 MHz，为量子传感用hBN提供了设计准则。
Quantum effects in condensed matter normally only occur at low temperatures. Here we show a large quantum effect in high-pressure liquid hydrogen at thousands of Kelvins. We show that the metallization transition in hydrogen is subject to a very large isotope effect, occurring hundreds of degrees lower than the equivalent transition in deuterium. We examined this using path integral molecular dynamics simulations which identify a liquid-liquid transition involving atomization, metallization, and changes in viscosity, specific heat and compressibility. The difference between H$_2$ and D$_2$ is …
Prediction of the neutron drip line in oxygen isotopes using quantum computation
本文采用VQE与UCC拟设及量子比特约化，在IonQ Aria上计算氧同位素基态能量，成功识别²⁴O为中子滴线核。
Quantifying the Dual-isotope Advantage for Ytterbium-array Surface Codes using Realistic Noise Models
本研究开发开源双同位素镱量子计算噪声模拟工具，证实双同位素阵列原位测量架构可降低表面码逻辑错误率，明确里德伯态衰减是FTQC性能的主要限制。
Tunneling phase diagram: A machine-learning framework for multidimensional kinetic isotope effects
提出隧穿相图机器学习框架，通过解码KIE与隧穿因子κ的非线性关系，实现真实隧穿强度的解耦，并发现300-600K区间的高KIE-低κ异常现象。
Recent experiments have confirmed the importance of nuclear quantum effects even in large biomolecules at physiological temperature. Here we describe how the path integral formalism can be used to describe rigorously the nuclear quantum effects on equilibrium and kinetic properties of molecules. Specifically, we explain how path integrals can be employed to evaluate the equilibrium (EIE) and kinetic (KIE) isotope effects, and the temperature dependence of the rate constant. The methodology is applied to the [1,5] sigmatropic hydrogen shift in pentadiene. Both the KIE and the temperature depend…
Isotope engineering for spin defects in van der Waals materials
本文提出基于宿主材料同位素工程的技术，通过生长同位素纯化的h10B15N晶体，显著提升了hBN中硼空位自旋缺陷的相干特性与磁传感灵敏度，并实现了核自旋的相干控制。
Entanglement is one of the most fundamental properties of quantum mechanics, and is the key resource for quantum information processing. Bipartite entangled states of identical particles have been generated and studied in several experiments, and post-selected or heralded entangled states involving pairs of photons, single photons and single atoms, or different nuclei in the solid state, have also been produced. Here, we use a deterministic quantum logic gate to generate a "hybrid" entangled state of two trapped-ion qubits held in different isotopes of calcium, perform full tomography of the s…
Rare earth doped crystals are promising systems for quantum information processing. In particular paramagnetic rare earths could be used to build coherent interfaces with optical and microwave photons. In addition, isotopes with non zero nuclear spins could provide long lived states for quantum state storage and processing. Yb3+ is particularly interesting in this respect since it is the only paramagnetic rare earth with a spin 1/2 isotope, which corresponds to the simplest possible level structure. In this paper, we report on the optical and magnetic properties of Yb3+ in the two sites of Y2S…
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