Radium ion: A possible candidate for measuring atomic parity violation

利用纠错奇偶快照测量非局域膜序

Measuring Non-local Brane Order with Error-corrected Parity Snapshots

本文面向光晶格中性原子量子仿真器，提出可区分关联粒子-空穴对与非关联空穴的纠错方法，恢复非局域奇偶关联信号并验证二维Mott绝缘体的广义膜序参量。

An optical lattice based method for precise measurements of atomic parity violation

We propose a method for measuring parity violation in neutral atoms. It is an adaptation of a seminal work by Fortson [Phys. Rev. Lett. {\bf 70}, 2383 (1993)], proposing a scheme for a single trapped ion. In our version, a large sample of neutral atoms should be localised in an optical lattice overlapping a grid of detection sites, all tailored as the single site in Fortson's work. The methodology is of general applicability, but as an example we estimate the achievable signal in an experiment probing a nuclear spin independent parity violation on the line $6\mathrm{s}\,^2\mathrm{S}_{1/2}$--$5…

Progress toward a first observation of parity violation in chiral molecules by high-resolution laser spectroscopy

Parity violation (PV) effects in chiral molecules have so far never been experimentally observed. To take this challenge up, a consortium of physicists, chemists, theoreticians and spectroscopists has been established and aims at measuring PV energy differences between two enantiomers by using high-resolution laser spectroscopy. In this article, we present our common strategy to reach this goal, the progress accomplished in the diverse areas, and point out directions for future PV observations. The work of André Collet on bromochlorofluoromethane enantiomers, their synthesis and their chiral r…

Possibility of a minimal purity-measurement scheme critically depends on the parity of dimension of the quantum system

In this paper, we investigate the possibility of measuring the purity of a quantum state (and the overlap between two quantum states) within a minimal model where the measurement device is minimally composed. The minimality is based on the assumptions that (i) we use a yes-no measurement on a single system to determine the single value of the purity in order not to extract other redundant information, and (ii) we use neither ancilla nor random measurement. We show that the measurability of the purity within this model critically depends on the parity of dimension of the quantum system: the pur…

宇称算符：在量子计量学中的应用

The Parity Operator: applications in quantum metrology

该文综述宇称算符在量子计量学多场景的应用，介绍其在拉姆齐光谱分辨率、原子宇称QND测量的原创结果，论证其作为最优可观测量的特性及在高精度原子钟的应用潜力。

Experimental Constraint on an Exotic Parity-Odd Spin- and Velocity-Dependent Interaction with a Single Electron Spin Quantum Sensor

n improved laboratory bound on the exotic spin- and velocity-dependent interaction at micrometer scale is established with a single electron spin quantum sensor. The single electron spin of a near-surface nitrogen-vacancy center in diamond is utilized as the quantum sensor and a vibrating half-sphere lens is taken as the source of the moving nucleons. The exotic interaction between the polarized electron and the moving nucleon source is explored by measuring the possible magnetic field felt by the electron spin quantum sensor. Our experiment set improved constraints on the exotic spin- and vel…

彭宁阱中单个分子离子的电弱核性质研究

Electroweak Nuclear Properties from Single Molecular Ions in a Penning Trap

提出在彭宁阱中利用强磁场使分子离子宇称态近简并，通过弱相互作用混合放大宇称不守恒效应，实现单分子级电弱核性质探测，适用于稀有及不稳定核素。

Revealing non-classical behaviours in the oscillatory motion of a trapped ion

The possibility of revealing non-classical behaviours in the dynamics of a trapped ion via measurements of the mean value of suitable operators is reported. In particular we focus on the manifestation known as `` Parity Effect\rq\rq which may be observed \emph{directly measuring} the expectation value of an appropriate correlation operator. The experimental feasibility of our proposal is discussed.

Single-shot quantum error correction with the three-dimensional subsystem toric code

We introduce a new topological quantum code, the three-dimensional subsystem toric code (3D STC), which is a generalization of the stabilizer toric code. The 3D STC can be realized by measuring geometrically-local parity checks of weight at most three on the cubic lattice with open boundary conditions. We prove that single-shot quantum error correction (QEC) is possible with the 3D STC, i.e., one round of local parity-check measurements suffices to perform reliable QEC even in the presence of measurement errors. We also propose an efficient single-shot QEC strategy for the 3D STC and investiga…

Determination of the Wigner function from photon statistics

We present an experimental realisation of the direct scheme for measuring the Wigner function of a single quantized light mode. In this method, the Wigner function is determined as the expectation value of the photon number parity operator for the phase space displaced quantum state.