Manipulating Quantum Information with Vibrational Qubits

Marquette大学的Dmitri Babikov和伊利诺伊大学Urbana-Champaign大学的Martin Gruebele得到了化学部理论、模型和计算方法计划的奖励，以开发计算方法来研究通过纠缠多原子振动来编码振动波包中的信息的问题。PI的目标是评估分子或分子离子是否可以帮助量子信息处理。一些理论预测通过在低温中性分子射流上进行的实验进行了验证。尽管这些测试实验并不符合真正的量子计算，但它们允许实现和利用高度相干。它们还提供了有关相干振动波包如何演化以及各种消相源的影响的重要信息。理论和实验相结合，实现了具有最多4个量子比特的门(例如，Shor的因数15分解算法)，以及硫光气分子的旋转和振动激发态。PI和他们的学生正在研究由分子旋转、场不均匀和不属于计算状态的振动态引起的消相干效应。量子计算和量子信息是新兴领域，它们试图利用量子力学的特殊性质，而且往往是非直观的性质，来实现使用当前技术非常困难甚至不可能进行的计算。利用多原子分子进行振动QC的实验演示为量子处理器的实际实现开辟了新的机会。计划在马凯特大学和伊利诺伊大学厄巴纳-香槟分校举办一系列跨学科研讨会，主题为量子控制和量子信息。

Dmitri Babikov of Marquette University and Martin Gruebele of the University of Illinois, Urbana-Champaign are supported by an award from the Theory, Models and Computational Methods program of the Chemistry division to develop computational methodologies to study the problem of encoding information in vibrational wave packets by entangling polyatomic vibrations. The PI's goal is to assess whether molecules or molecular ions could help quantum information processing. Some of the theoretical predictions are tested using experiments carried out on jets of neutral molecules at low temperature. Although these test experiments do not correspond to true quantum computing, they allow achieving and utilizing a high degree of coherence. They also give rise to important information on how the coherent vibrational wave packets evolve as well as the effect of various sources of dephasing. Theory and experiment are combined to achieve gates with up to 4 qubits (e.g. Shor's algorithm for factorizing the number 15) with rotationally and vibrationally excited states of the thiophosgene molecule. The PIs and their students study the effects of decoherence induced by molecular rotations, field inhomogeneities, and vibrational states not part of the computing states are being explored. Quantum computing and quantum information are emerging fields that attempt to use the special, and often non-intuitive, properties of quantum mechanics to enable calculations that are very difficult or even impossible using current technology. Experimental demonstration of vibrational QC using a polyatomic molecule opens up new opportunities for the practical realization of a quantum processor. A series of interdisciplinary seminars are planned to take place at both Marquette University and the University of Illinois at Urbana-Champaign on the topics of Quantum Control and Quantum Information.