Fast nuclear-spin gates and electrons-nuclei entanglement of neutral atoms in weak magnetic fields

IF 6.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Xiao-Feng Shi
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Abstract

We present a novel class of Rydberg-mediated nuclear-spin entanglement in divalent atoms with global laser pulses. First, we show a fast nuclear-spin controlled phase gate of an arbitrary phase realizable either with two laser pulses when assisted by Stark shifts, or with three pulses. Second, we propose to create an electrons–nuclei-entangled state, which is named a super bell state (SBS) for it mimics a large Bell state incorporating three small Bell states. Third, we show a protocol to create a three-atom electrons-nuclei entangled state which contains the three-body W and Green-berger–Horne–Zeilinger (GHZ) states simultaneously. These protocols possess high intrinsic fidelities, do not require single-site Rydberg addressing, and can be executed with large Rydberg Rabi frequencies in a weak, Gauss-scale magnetic field. The latter two protocols can enable measurement-based preparation of Bell, hyperentangled, and GHZ states, and, specifically, SBS can enable quantum dense coding where one can share three classical bits of information by sending one particle.

Abstract Image

弱磁场中性原子的快速核-自旋门和电子-核纠缠
我们利用全局激光脉冲在二价原子中展示了一类新型的雷德贝格介导的核自旋纠缠。首先,我们展示了一种任意相位的快速核自旋控制相位门,它可以在斯塔克偏移的辅助下用两个激光脉冲实现,也可以用三个脉冲实现。其次,我们提议创建一个电子-核纠缠态,并将其命名为超级贝尔态(SBS),因为它模拟了一个包含三个小贝尔态的大贝尔态。第三,我们展示了一种创建三原子电子-核纠缠态的协议,它同时包含三体 W 和格林-伯格-霍恩-蔡林格(GHZ)态。这些协议具有很高的固有保真度,不需要单点雷德贝格寻址,而且可以在弱高斯尺度磁场中以较大的雷德贝格拉比频率执行。后两种协议可以实现基于测量的贝尔态、超纠缠态和 GHZ 态的制备,特别是 SBS 可以实现量子密集编码,即发送一个粒子就可以共享三个经典比特的信息。
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来源期刊
Frontiers of Physics
Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
9.20
自引率
9.30%
发文量
898
审稿时长
6-12 weeks
期刊介绍: Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.
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