多模腔中尺寸可调的Unruh-DeWitt探测器
Tunable-Size Unruh-DeWitt Detector in a Multimode Cavity
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中文总结 AI 辅助
本研究提出多模腔介导的动量选择性Unruh-DeWitt探测器，可在实验可及加速度下增强信号，为相对论量子场研究提供通用平台。
中文摘要 AI 辅助
基于玻色-爱因斯坦凝聚体（BEC）的量子模拟器为实验室研究相对论量子场现象提供了强大平台，尤其可模拟相对论类比粒子探测器。然而，此类探测器通常与超出声学声子 regime 的激发耦合，非线性 Bogoliubov 色散引入的修正会导致有效相对论描述失效。我们提出利用本质上动量选择性的 Unruh-DeWitt 探测器模型克服这一局限，其中光镊捕获的原子通过多模光腔与凝聚体耦合。尽管原子本质上是点状的，但腔介导的相互作用核使其能采样 BEC 可控有限区域内的密度涨落，等效于有限尺寸探测器。有效探测器尺寸可通过腔模结构调控，确定可控动量截止以滤除非声子激发。我们解析计算了该探测器在均匀直线加速和匀速圆周运动下的响应，表明这种动量选择性可在实验可及的加速度下增强信号。该方案与现有腔-QED 平台兼容，为类比量子场测量或相对论量子信息协议提供了通用设置。
英文摘要
Quantum simulators based on Bose-Einstein condensates (BECs) provide a powerful platform to study relativistic quantum-field phenomena in the lab and in particular emulate relativistic analog particle detectors. However, such detectors typically couple to excitations beyond the acoustic phonon regime, so that the nonlinear Bogoliubov dispersion introduces corrections that cause the effective relativistic description to break down. We propose to overcome this limitation using an intrinsically momentum-selective Unruh-DeWitt detector model in which a tweezer-trapped atom couples to the condensate through a multimode optical cavity. Although the atom is effectively pointlike, the cavity-mediated interaction kernel causes it to sample density fluctuations over a controllable finite region of the BEC equivalent to a finite-size detector. The effective detector size is tunable via the cavity mode structure determining a controllable momentum cutoff that filters out nonphononic excitations. We analytically calculate the response of such a detector for uniform linear acceleration and uniform circular motion and show that this momentum selectivity can enhance the signal at experimentally accessible accelerations. Compatible with existing cavity-QED platforms our scheme thus provides a versatile setting for analog quantum-field measurements or relativistic quantum-information protocols.
发表机构
- Institut für Theoretische Physik, Universität Innsbruck（因斯布鲁克大学理论物理研究所）
- Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences（奥地利科学院量子光学与量子信息研究所）
- Okinawa Institute of Science and Technology Graduate University（冲绳科学技术大学院大学）
- Institute of Physics, Maria Curie-Skłodowska University（玛丽亚·居里-斯克沃多夫斯卡大学物理研究所）
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