Terahertz quantum sensing with bilayer graphene quantum dots in resonators

新兴的量子技术领域有望在传感、高性能计算、仿真、密码学和计量学等领域取得前所未有的进步。迄今为止，这些技术主要在微波和光学领域实施，在太赫兹（THz）光谱范围内具有未开发的潜力。利用这个频域可能有许多好处，包括通过量子密码术实现上级无线通信安全性，并提高固态量子比特的工作温度，从而有可能克服现有的可扩展性问题。此外，太赫兹辐射操纵分子量子态的能力为新的量子计算和模拟平台铺平了道路。最后，通过其他不透明材料的透射率，或对瑞利散射的鲁棒性可能是太赫兹辐射用于量子传感应用的重要资产。尽管有这些前景，但由于太赫兹技术与微波和光学技术相比相对不成熟，太赫兹量子系统还相当未开发。到目前为止，在太赫兹频率下的量子传感成果很少。“ThinQ”提出了一个开拓性的奋进，进入未开发的太赫兹（THz）量子传感领域。通过利用Bernal堆叠的双层石墨烯（BLG）量子点（QD）耦合到THz谐振器的独特电子特性，该项目旨在开发一种超越标准量子极限的THz量子传感新技术。该倡议分为两个主要重点领域。第一集中在太赫兹光子探测器的发展和表征。这将利用BLG双量子点（DQD）耦合到一个高品质因子太赫兹谐振器，以增强光-物质相互作用，并提高光子到电子转换的方向性。目标是证明具有上级量子效率的THz光子探测，并改进单个THz光子探测的方法。第二个重点领域是通过利用非经典光来超越标准量子极限的量子传感。通过利用THz谐振器与BLG DQD的强耦合，我们的目标是产生THz压缩光，这是一种超越经典传感器能力的量子态。此外，该项目还将探索用于检测太赫兹光非经典态的超强耦合机制。总而言之，“ThinQ”代表了释放太赫兹量子技术潜力的大胆尝试。通过有效地集成BLG量子点和太赫兹谐振器，我们将开发具有无与伦比的灵敏度和新颖的构建块的太赫兹探测器与压缩光量子传感。这将为新的加密和计算方案打开大门，并为太赫兹领域的量子技术进步做出重大贡献。

The emerging realm of quantum technologies promises unprecedented advances in fields such as sensing, high-performance computing, simulation, cryptography, and metrology. These technologies have been so far implemented predominantly in the microwave and optical regimes and have an untapped potential in the terahertz (THz) spectral range. Exploiting this frequency domain could have a number of benefits, including superior wireless communication security through quantum cryptography, and increase the operating temperature of solid-state qubits, thus potentially overcoming existing scalability issues. Moreover, THz radiation's ability to manipulate quantum states of molecules paves the way for new quantum computation and simulation platforms. Finally, the transmissivity through otherwise opaque materials, or robustness against Rayleigh scattering may be important assets of THz radiation for quantum sensing applications. Despite these prospects, THz quantum systems are fairly unexplored due to the relative immaturity of THz technology compared to microwave and optical counterparts. To date, there are very few achievements of quantum sensing at THz frequencies. "ThinQ" proposes a pioneering endeavor into the underexplored realm of terahertz (THz) quantum sensing. By leveraging the unique electronic properties of Bernal-stacked bilayer graphene (BLG) quantum dots (QDs) coupled to THz resonators, the project aims to develop a new technology for THz quantum sensing that goes beyond the standard quantum limit. The initiative is partitioned into two primary focus areas. The first concentrates on the development and characterization of THz photon detectors. This will utilize BLG double QDs (DQDs) coupled to a high-quality factor THz resonator to enhance light-matter interaction and to improve directivity for photon-to-electron conversion. The goal is to demonstrate THz photon detection with superior quantum efficiency and refine the approach for single THz photon detection. The second focus area embarks on quantum sensing beyond the standard quantum limit by harnessing non-classical light. By capitalizing on the strong coupling of a THz resonator with BLG DQD, we aim to generate THz squeezed light, a quantum state that surpasses classical sensor capabilities. Furthermore, the project will explore the ultra-strong coupling regime for the detection of non-classical states of THz light. In conclusion, "ThinQ" represents an audacious attempt to unlock the potential of THz quantum technology. By effectively integrating BLG QDs and THz resonators, we will develop THz detectors with unmatched sensitivity and novel building blocks for quantum sensing with squeezed light. This will open the door to novel encryption and computing schemes and contribute significantly to the advancement of quantum technology in the THz regime.