Full Characterization of a Cavity Electromagnetically Induced Transparency Based Quantum Gate

腔体电磁感应透明量子门的全面表征

• 批准号: 1404398
• 负责人: Eden Figueroa
• 金额: $ 51.1万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1404398&HistoricalAwards=false
• 关键词: Full; Characterization; Cavity; Electromagnetically; Induced

The field of quantum information science is an intensely pursued research area due to the technological impact that a realized quantum computer would have. The availability of a trustworthy quantum processor would revamp numerous aspects of science and engineering, including the optimization of chemical reactions, the development of ultra-secure communication channels, and the materialization of powerful computers. After nearly twenty years of experimental research, technologies have emerged that may serve as the elementary building blocks for a quantum processor. Among these are technologies associated with the interaction of photons and atoms. The supported research group aims to develop a milestone towards building a quantum processor: the realization of an interface between two single photons and atoms in a configuration designed to perform logic operations at the quantum level.The goal of this work is to fully characterize a proof of principle system capable of a two-qubit operation using light. To accomplish this goal the supported research group will interface two of the most powerful tools in quantum optics; that of cavity quantum electrodynamics (cavity QED) for strong light-matter coupling and electromagnetically induced transparency (EIT) to allow control of large optical nonlinearities. The research program will pursue two primary objectives. First, the group will finish construction of the first experimental setup in which two cavities are coupled simultaneously to a 87Rb ensemble, thereby creating an interaction medium for two independent optical modes (qubits). Under EIT conditions, the cavity fields will experience an enhanced interaction strength permitting the observation of nonlinear effects using single-photon fields, the essential component of a quantum optical gate. Once achieved, the second objective is to fully characterize the gate operation using a technique known as coherent state quantum process tomography (csQPT). This tool allows the characterization of quantum optical processes, such as gates, using only coherent states which are readily available from a common laser source.

量子信息科学领域是一个非常热门的研究领域，因为实现量子计算机将产生技术影响。值得信赖的量子处理器的可用性将改变科学和工程的许多方面，包括化学反应的优化，超安全通信信道的开发以及强大计算机的实现。经过近20年的实验研究，已经出现了可以作为量子处理器基本构建模块的技术。其中包括与光子和原子相互作用有关的技术。支持的研究小组的目标是开发一个里程碑，朝着建立一个量子处理器：实现两个单光子和原子之间的接口，在一个配置，旨在执行逻辑运算在量子水平。这项工作的目标是充分表征一个原理证明系统，能够使用光的两个量子位操作。为了实现这一目标，支持的研究小组将接口量子光学中两个最强大的工具;腔量子电动力学（腔QED）用于强光物质耦合和电磁诱导透明（EIT），以控制大的光学非线性。该研究计划将追求两个主要目标。首先，该小组将完成第一个实验装置的构建，其中两个腔同时耦合到87 Rb系综，从而为两个独立的光学模式（量子比特）创建相互作用介质。在EIT条件下，腔场将经历增强的相互作用强度，允许使用单光子场观察非线性效应，这是量子光门的重要组成部分。一旦实现，第二个目标是使用称为相干态量子过程层析成像（CSQPT）的技术来充分表征门操作。这个工具允许量子光学过程的表征，如门，只使用相干态，这是很容易从一个共同的激光源。