ITR: Quantum Computation with Trapped Polar Molecules

EIA-0081332DeMille，DavidYale University ITR：使用捕获的极性分子的量子计算David DeMille这个项目正在为设计量子计算机的一种新的技术方法奠定基础，这种方法似乎可以在退相干之前将执行的操作数量提高几个数量级。这种设计中的量子力学比特由双原子分子的电偶极矩组成，这些偶极矩可以沿着或反对外部电场定向。由于每个偶极子产生的电场影响其邻居的能量，因此建立了用于逻辑运算的位之间的耦合。分子偶极子被捕获在由驻波激光束形成的线性阵列中。据估计，这一设计可以导致一台拥有10,000个量子比特的量子计算机，它可以在退相干前的1-10秒内执行10万个处理器步骤。这个项目将从两个方面着手：一个是超冷分子的来源，另一个是极化分子之间耦合的演示。这项工作的第一阶段将是通过在磁光陷阱中同时收集Rb和Cs原子，然后将它们光缔合形成超冷红细胞分子来开发分子源。第二阶段将通过测量分子电共振频率作为密度和外加电场的函数来证明分子之间耦合的可能性。一旦观察到效果，该项目将转向为量子计算机建造光学陷阱。在这个项目期间，量子计算机所需的大部分技术要素的演示都将成为可能。

EIA-0081332DeMille, DavidYale UniversityITR: Quantum Computation with Trapped Polar MoleculesDavid DeMilleThis project is developing the basis for a new technical approach to the design of a quantum computer, which can plausibly achieve several orders of magnitude improvement in number of operations performed before decoherence. The quantum mechanical bits in this design consist of the electric dipole moments of diatomic molecules, which may be oriented either along or against an external electric field. Coupling between bits for logical operations is established because the electric field created by each dipole influences the energy of its neighbors. The molecular dipoles are trapped in a linear array formed by a standing-wave laser beam. It is estimated that this design can lead to a quantum computer with 10,000 qubits, which can perform 100,000 processor steps in the 1-10 seconds before decoherence.This project will address two aspects of the development of this approach: a source of ultracold molecules, and demonstration of the couplings between polarized molecules. The first stage of the work will be development of the source of molecules by simultaneously collecting Rb and Cs atoms in a magneto-optic trap, then photoassociating them to form ultracold RbCs molecules. The second stage will demonstrate the possiblilty of coupling between molecules by measurement of molecular electric resonance frequencies as a function of density and applied electric field. Once the effect has been observed the project will turn to the construction of an optical trap for the quantum computer. Demonstrations of most of the technical elements necessary for the quantum computer will be possible within the period of this project.