Bosonic CNOT gates with Quantum Interrogation

Quantum interrogation logic gates

Quantum interrogation can be used as a basic resource for quantum information. This paper presents its applications to entanglement creation and to optical quantum computation. The starting point will be a photon to particle quantum interrogation CZ gate, from which three families of optical CNOT gates will be derived. These gates are nondestructive and can work with probabilities arbitrarily close to 1. A possible experimental implementation with atomic ensembles is also discussed.

A high-performance optical lattice clock based on bosonic atoms

Optical lattice clocks with uncertainty and instability in the $10^{-17}$-range and below have so far been demonstrated exclusively using fermions. Here, we demonstrate a bosonic optical lattice clock with $3\times 10^{-18}$ instability and $2.0\times 10^{-17}$ accuracy, both values improving on previous work by a factor 30. This was enabled by probing the clock transition with an ultra-long interrogation time of 4 s, using the long coherence time provided by a cryogenic silicon resonator, by careful stabilization of relevant operating parameters, and by operating at low atom density. This wor…

基于玻色子样本的非平衡量子测温

Non-equilibrium quantum thermometry with bosonic samples

研究强耦合非马尔可夫玻色子探针的非平衡量子测温，发现量子Fisher信息随时间非单调且存在最优测量时间，压缩态提供瞬态优势，强耦合下低温相对误差呈多项式发散。

Quantum Computational Representation of the Bosonic Oscillator

By the early eighties, Fredkin, Feynman, Minsky and others were exploring the notion that the laws of physics could be simulated with computers. Feynman's particular contribution was to bring quantum mechanics into the discussion and his ideas played a key role in the development of quantum computation. It was shown in 1995 by Barenco et al that all quantum computation processes could be written in terms of local operations and CNOT gates. We show how one of the most important of all physical systems, the quantized bosonic oscillator, can be rewritten in precisely those terms and therefore des…

利用多回路 SQUID 工程化玻色模式的非线性

Engineering the Nonlinearity of Bosonic Modes with a Multi-loop SQUID

针对玻色系统高阶非线性难构建且低阶项难抑制的问题，提出 NEMS 多回路 SQUID 框架，通过磁通调控实现纯三次至五次相互作用并抑制寄生耦合。

使用快速含噪操作的高性能重复 cat 码

High-performance repetition cat code using fast noisy operations

本文针对重复 cat 码提出利用快速含噪 CNOT 与快速辅助量子比特进行稳定子测量的优化，提高物理损耗比阈值并降低阈值下逻辑纠错开销。