Light-mediated strong coupling between a mechanical oscillator and atomic spins one meter apart

Quantum Logic Between Distant Trapped Ions

Trapped atomic ions have proven to be one of the most promising candidates for the realization of quantum computation due to their long trapping times, excellent coherence properties, and exquisite control of the internal atomic states. Integrating ions (quantum memory) with photons (distance link) offers a unique path to large-scale quantum computation and long-distance quantum communication. In this article, we present a detailed review of the experimental implementation of a heralded photon-mediated quantum gate between remote ions, and the employment of this gate to perform a teleportation…

临界驱动腔磁振子学中的异常长程相干性

Anomalous Long-Distance Coherence in Critically-Driven Cavity Magnonics

本文在线性区腔磁振子学中通过临界耦合实现2米远程磁振子-光子强相干，并发现周期倍增与线宽内模式分裂两种传统理论无法解释的异常。

Cavity assisted generation of sustainable macroscopic entanglement of ultracold gases

Prospects for reaching persistent entanglement between two spatially separated atomic Bose-Einstein condensates are outlined. The system set-up comprises of two condensates loaded in an optical lattice, which, in return, is confined within a high-Q optical resonator. The system is driven by an external laser that illuminates the atoms such that photons can scatter into the cavity. In the superradiant phase a cavity field is established and we show that the emerging cavity mediated interactions between the two condensates is capable of entangling them despite photon losses. This macroscopic ato…

磁振子与光子的长距离强耦合：多模波导效应

Long-distance strong coupling of magnon and photon: Effect of multi-mode waveguide

本文通过引入多模波导与临界耦合机制，解释了磁振子与光子在超过两米距离上实现强耦合的实验现象，为磁振子分布式量子网络设计提供了理论依据。

Unconditional quantum teleportation between distant solid-state qubits

Realizing robust quantum information transfer between long-lived qubit registers is a key challenge for quantum information science and technology. Here we demonstrate unconditional teleportation of arbitrary quantum states between diamond spin qubits separated by 3 meters. We prepare the teleporter through photon-mediated heralded entanglement between two distant electron spins and subsequently encode the source qubit in a single nuclear spin. By realizing a fully deterministic Bell-state measurement combined with real-time feed-forward we achieve teleportation in each attempt while obtaining…

级联手性网络中的多体量子光学

Many-body quantum optics in a cascaded chiral network

研究利用特定架构实现超导量子比特级联网络，克服瓶颈，实现跨越两个模块的四量子比特链，利用共享波导稳定可重构纠缠，观察到光子按数排序，为多体光 - 物质状态提供实验途径。

Tutorial: Cavity Quantum Optomechanics

Exploring quantum physics in macroscopic systems and manipulating these systems for various technological applications has been a topic of intense research in the last one decade or so. In this regard, the field of cavity quantum optomechanics turns out to be one of the most rapidly emerging area of research. It has opened many doors to study various open ended fundamental questions in quantum physics, apart from numerous possible applications. A typical cavity optomechanical system consists of two mirrors, one fixed while the other one is movable. These systems may be of micrometer or nano-me…

Fast and efficient deterministic quantum state transfer between two remote mechanical resonators

The main challenge in deterministic quantum state transfer in long-distance quantum communications is the transmission losses in the communication channel. To overcome this limitation, here we use the adiabatic theorem and find a lossless evolution path between two remote mechanical modes. By adiabatic variation of the effective coupling strengths between the two nodes and the intermediate optical channel modes, we engineer a transmission path for the quantum state transfer that is decoupled from the decaying fiber modes. Using our proposed method we show that one obtains a quantum state trans…

Strong coupling between moving atoms and slow-light Cherenkov photons

We describe the coupling of moving atoms to a one dimensional photonic waveguide in the regime where the atomic velocities are comparable to the effective speed of light. Such conditions could be achieved, for example, in photonic crystals or coupled resonator arrays, where the maximal photonic group velocity is significantly reduced compared to free space. In this case the interplay between a velocity-induced directionality and the emergence of new divergencies in the photonic density of states gives rise to a range of novel phenomena and non-perturbative effects in the emission of photons an…

远距离超导芯片间的确定性量子隐形传态

Deterministic quantum teleportation between distant superconducting chips

该研究通过64米长超低损耗电缆总线连接远距离超导芯片，利用飞行微波光子实现确定性量子态和纠缠门隐形传态，为分布式超导量子计算网络奠定基础。

Decoherence-free interaction between giant atoms in waveguide QED

In quantum-optics experiments with both natural and artificial atoms, the atoms are usually small enough that they can be approximated as point-like compared to the wavelength of the electromagnetic radiation they interact with. However, superconducting qubits coupled to a meandering transmission line, or to surface acoustic waves, can realize "giant artificial atoms" that couple to a bosonic field at several points which are wavelengths apart. Here, we study setups with multiple giant atoms coupled at multiple points to a one-dimensional (1D) waveguide. We show that the giant atoms can be pro…

CZ门保真度高于$99.8\\%$的长距离transmon耦合器

Long-distance transmon coupler with CZ gate fidelity above $99.8\%$

本研究提出基于悬浮transmon的可调长距离量子比特耦合器，通过波导介导耦合实现2毫米间距下50MHz以上耦合，降低串扰并预留读出器件空间，达成99.81%保真度的CZ门，助力可扩展量子处理器研发。

共形场论中基于子系统的Petz恢复

Petz recovery from subsystems in conformal field theory

本文利用twirled Petz map恢复通道探究1+1维CFT真空态的多体纠缠结构，证明距离度量仅依赖中心荷与交比，并发现保真度严格优于信息论下界。