Quantum: Ultrastable heterodyne quantum information

量子：超稳定外差量子信息

• 批准号: 0622100
• 负责人: Olivier Pfister
• 金额: $ 27.5万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0622100&HistoricalAwards=false
• 关键词: Quantum; Ultrastable; heterodyne; quantum; information

The proposal "Ultrastable heterodyne quantum information" is a renewal request to support theactivity of the Quantum Optics and Quantum Information (QOQI) group in the Physics Department of the University of Virginia (UVa).The foundation of quantum information is the use of the mathematical axioms of quantum mechanics to process, store, and transmit information. One expects several benefits from such an approach. First and foremost, quantum computing can yield an exponential speedup over classical computation for certain problems, such as predicted by Feynman for simulating quantum systems and by Shor for factoring integers. Moreover, quantum key distribution also brings complete security against eavesdropping to cryptography.Daunting challenges face attempts at experimentally realizing a quantum computer. On the one hand, one needs scalability, i.e. a large number of quantum logic units ("qubits" if binary ones or "qudits" if multi-state ones), all individually addressable and able to interact pairwise to become entangled. On the other hand, one needs this interaction to be strictly controlled and limited to the qubits or qudits, in order to avoid decoherence, which is the measurement-like, irreversible random evolution that results from interaction of a quantum register with the environment, a reservoir of quantum systems. Spontaneous emission is an example of decoherence for atoms.This project is dedicated to all-optical implementation of quantum information. Light has remarkable resistance to decoherence, due to its extremely weak (photon-photon) interaction. This, is turn, may present a difficulty for generating quantum entanglement (aforementioned pairwise interactions) but this problem is solved by the use of the mature and ever more sophisticated techniques of nonlinear optics and, in our case, of the laser-like, highly spatially and temporally coherent optical beams emitted by the optical parametric oscillator (OPO). The potential of OPO's for quantum information and, in particular, quantum communication, is very well known but is still far from having been fully exploited. The experimental approach of the proposal is centered on marrying the principles and techniques of ultra-high resolution laser spectroscopy and time-frequency metrology to those of nonlinear and quantum optics. This proposal aims at extending classical signal processing techniques into the quantum domain, in particular by using the frequency domain to encode the qudits and realize "quantum multiplexing," a quantum optical version of FM versus AM radio signals. This will be realized with state-of-the-art phase- and frequency-stabilized OPO's and will subsequently enable the transfer of quantum information, by teleportation or direct entanglement, between different types of physical qudits, such as alkali atoms (quantum memory) or photons in optical fibers (quantum bus). Applications of qudit-based dense coding to ultrasensitive optical measurements impossible with qubits are also discussed.Broader impacts of the proposed work comprise an active contribution to the UVa Physics graduate program, with the direct research advising of five students, of several Departmental seminars per year, and of a new advanced course "Quantum Optics and Quantum Information" (Phys 888), which was created in the spring of 2005 by the P.I. In addition, undergraduate students are periodically joining in the research effort at various levels, including graduate research. Also included are collaborative efforts with UVa Engineering faculty to foster cross-Departmental research. Finally, broader dissemination of research results includes the organization of interdisciplinary conferences at UVa, in association with the Department of Mathematics. The P.I. co-organized one such conference, "Coding Theory and Quantum Computing," in May 2003 and has plans to reiterate in the near future.

提案“超强的杂种量子信息”是续约要求，旨在支持弗吉尼亚大学物理系（UVA）物理系的量子光学和量子信息（QOQI）组的杂物。人们期望这种方法从这种方法中获得一些好处。首先，对于某些问题，量子计算可以在经典计算上产生指数加速，例如Feynman预测用于模拟量子系统的预测以及用于考虑整数的shor。此外，量子密钥分布还为窃听到密码学带来了完全的安全性。挑战挑战面临实验实现量子计算机的尝试。一方面，一个人需要可伸缩性，即大量的量子逻辑单元（如果二进制逻辑单元”或“如果多态（如果多态）”），则可以单独寻址并能够成对交互以纠缠在一起。另一方面，需要严格控制这种相互作用，并限于量子或Qudits，以避免反应，这是量子寄存器与环境（量子系统储层）的相互作用而导致的类似测量的，不可逆的随机演变。自发发射是原子的变形的一个例子。该项目致力于全光实施量子信息。由于其极度弱（光子 - 光子）相互作用，光具有显着的抗性性。转弯，这可能会引起产生量子纠缠的困难（前面提到的成对相互作用），但是通过使用非线性光学的成熟和更复杂的技术来解决此问题，在我们的情况下，光空间和时间上的光学光束高度和时间相干光束由光学访问仪（Opciltic parametric parametric opiall oscill oscill oco）（OPO）（OPO）。 OPO对量子信息，尤其是量子通信的潜力是众所周知的，但距离完全被充分利用仍然很远。该提案的实验方法集中在与非线性和量子光学的超高分辨率激光光谱和时频计量学的原理和技术结合。该建议旨在将经典信号处理技术扩展到量子域，特别是通过使用频域来编码Qudits并实现“量子多路复用”，这是FM与AM无线电信号的量子光学版本。这将通过最先进的相位和频率稳定的OPO实现，随后将通过传送或直接纠缠在不同类型的物理Qudit之间传递量子信息，例如碱原子（量子存储器）（量子存储器）或光纤维中的光子（量子总线）（量子总线）。还讨论了基于QUDIT的密集编码到超敏感的光学测量中的应用。拟议工作的Boader对UVA物理研究生课程的影响包括对UVA物理研究生课程的积极贡献，直接研究咨询五个学生，每年几个部门的研讨会，以及新的高级课程“量子和量子”的典型信息和量子的规定。此外，本科生定期加入各个级别的研究工作，包括研究生研究。还包括与UVA工程学院的合作努力，以促进跨部门研究。最后，对研究结果的更广泛的传播包括与数学系联合的UVA跨学科会议的组织。 P.I. 2003年5月，共同组织了一次这样的会议“编码理论和量子计算”，并计划在不久的将来重申。