Collaborative Research: FET: Small: Towards full photon utilization by adaptive modulation and coding on quantum links

合作研究：FET：小型：通过量子链路上的自适应调制和编码实现光子的充分利用

• 批准号: 2008728
• 负责人: Lara Dolecek
• 金额: $ 33.3万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-10-01 至 2022-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2008728&HistoricalAwards=false
• 关键词: Collaborative; Research; FET; Small; Towards

Secure communication has long been an indispensable part of numerous systems, ranging from the more traditional such as finance and defense to the emerging ones such as the internet of (battlefield) things and health data management. Traditional data encryption methods based on using public keys are threatened by the advances in quantum computing algorithms promising to efficiently solve otherwise intractable problems which make public key encryption secure. However, it is precisely quantum information processing advances that are also expected to enable secure communications by allowing efficient and secure private key distribution. The main advantage of private key encryption is that as long as the key strings are truly secret, it is provably secure, that is, insensitive to advances in computing. A Quantum Key Distribution (QKD) protocol describes how two parties, commonly referred to as Alice and Bob, can establish a secret key by communicating over a quantum and a public classical channel that both can be accessed by an eavesdropper Eve. For the widespread adoption of QKD, it is mandatory to provide high key rates over long distances. What has appeared as a bottleneck in practice is the inability to maximize the utility of information-bearing quantum states. This project seeks to solve this inefficiency problem. The results will pave the way for practical quantum networks in which multiple receivers communicate with a source simultaneously though multi-channel entanglement distribution.This project focuses on maximizing the utility of photons in frequency-time entanglement based QKD, through a combination of innovations in adaptive photon generation-aware modulation and coding, and a state of the art experimental validation. QKD offers a physically secure way for establishing an encryption key over a quantum and a public communication channel, both of which are observed by an eavesdropper. Because of the growing demand for quantum communications, research on improving QKD protocols has steeply intensified. One recent breakthrough is the experimental observation of continuous-variable frequency-time hyperentangled photons. This high-dimensional large Hilbert-space approach promises high information efficiency by potentially carrying multiple bits per an entangled photon pair. However, to ensure unconditional security in QKD, the biphotons (whether carrying single qubit or multiple qubits per photon), must be transmitted under photon-starved conditions, creating an immediate need to maximize utility of all generated biphotons. The project will offer an integrated solution consisting of photon-aware modulation and coding schemes, and will be the first such to be demonstrated on time-bin encoded multi-dimensional biphotons.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

长期以来，安全通信一直是众多系统不可或缺的一部分，从金融和国防等传统系统到（战场）物联网和健康数据管理等新兴系统。基于使用公钥的传统数据加密方法受到量子计算算法进步的威胁，量子计算算法有望有效解决原本棘手的问题，从而确保公钥加密的安全。 然而，正是量子信息处理的进步也有望通过允许高效和安全的私钥分发来实现安全通信。私钥加密的主要优点是，只要密钥字符串真正保密，它就是可证明安全的，即对计算的进步不敏感。量子密钥分发 (QKD) 协议描述了两方（通常称为 Alice 和 Bob）如何通过量子通道和公共经典通道进行通信来建立秘密密钥，窃听者 Eve 都可以访问这两个通道。为了广泛采用 QKD，必须提供长距离的高密钥速率。实践中出现的瓶颈是无法最大化承载信息的量子态的效用。该项目旨在解决效率低下的问题。研究结果将为实用的量子网络铺平道路，在该网络中，多个接收器通过多通道纠缠分布同时与源进行通信。该项目的重点是通过结合自适应技术的创新，最大限度地提高基于频率-时间纠缠的 QKD 中光子的效用。光子生成感知调制和编码，以及最先进的实验验证。 QKD 提供了一种物理安全的方式，用于通过量子和公共通信通道建立加密密钥，窃听者可以观察到这两种通道。由于量子通信的需求不断增长，改进 QKD 协议的研究急剧加强。最近的一项突破是连续可变频率时间超纠缠光子的实验观察。这种高维大希尔伯特空间方法通过每个纠缠光子对可能携带多个比特来保证高信息效率。然而，为了确保 QKD 的无条件安全性，双光子（无论是每个光子携带单个量子位还是多个量子位）必须在光子匮乏的条件下传输，从而迫切需要最大化所有生成的双光子的效用。该项目将提供由光子感知调制和编码方案组成的集成解决方案，并将是第一个在时间仓编码的多维双光子上进行演示的解决方案。该奖项反映了 NSF 的法定使命，并被认为值得通过以下方式获得支持：使用基金会的智力价值和更广泛的影响审查标准进行评估。

项目成果

GRADE-AO: Towards Near-Optimal Spatially-Coupled Codes With High Memories

GRADE-AO：迈向具有高内存的近乎最优空间耦合代码

• DOI: 10.1109/isit45174.2021.9517931
• 发表时间: 2021
• 期刊: IEEE International Symposium on Information Theory
• 作者: Yang, Siyi;Hareedy, Ahmed;Venkatasubramanian, Shyam;Calderbank, Robert;Dolecek, Lara
• 通讯作者: Dolecek, Lara

648 Hilbert-space dimensionality in a biphoton frequency comb: entanglement of formation and Schmidt mode decomposition

• DOI: 10.1038/s41534-021-00388-0
• 发表时间: 2021-03-11
• 期刊: NPJ QUANTUM INFORMATION
• 影响因子: 7.6
• 作者: Chang, Kai-Chi;Cheng, Xiang;Wong, Chee Wei
• 通讯作者: Wong, Chee Wei