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arXiv 2009.14342quant-phphysics.atom-ph
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玻色子介导相互作用的量子放大

Quantum amplification of boson-mediated interactions

S. C. Burd, R. Srinivas, H. M. Knaack, W. Ge, A. C. Wilson, D. J. Wineland, D. Leibfried, J. J. Bollinger, D. T. C. Allcock, D. H. Slichter

摘要:

量子物体之间强而精确控制的相互作用对于量子信息处理、模拟和传感以及奇异量子物质的形成是必不可少的。耦合弱相互作用的量子物体的一个公认的范例是使用辅助玻色子量子激发来调解相互作用。重要的例子包括原子之间的光子介导的相互作用,超导量子位,钻石中的色心,以及被困离子之间的声子介导的相互作用,以及光学和微波光子之间的相互作用。玻色子介导的相互作用原则上可以通过玻色子通道的参数驱动来放大;驱动不需要直接耦合到相互作用的量子对象。该技术已被提出用于各种量子平台,但迄今为止尚未在实验室中实现。在这里,我们实验证明了放大玻色子介导的相互作用之间的两个捕获离子量子比特的参数调制的捕获势。放大提供了高达3.25倍的相互作用强度增加,通过测量两个量子比特纠缠门的加速验证。这种放大技术可以用于任何量子平台,其中玻色子通道的参数调制是可能的,使得能够探索新的参数制度和增强的量子信息处理。

英文摘要:

Strong and precisely-controlled interactions between quantum objects are essential for quantum information processing, simulation, and sensing, and for the formation of exotic quantum matter. A well-established paradigm for coupling otherwise weakly-interacting quantum objects is to use auxiliary bosonic quantum excitations to mediate the interactions. Important examples include photon-mediated interactions between atoms, superconducting qubits, and color centers in diamond, and phonon-mediated interactions between trapped ions and between optical and microwave photons. Boson-mediated interactions can in principle be amplified through parametric driving of the boson channel; the drive need not couple directly to the interacting quantum objects. This technique has been proposed for a variety of quantum platforms, but has not to date been realized in the laboratory. Here we experimentally demonstrate the amplification of a boson-mediated interaction between two trapped-ion qubits by parametric modulation of the trapping potential. The amplification provides up to a 3.25-fold increase in the interaction strength, validated by measuring the speedup of two-qubit entangling gates. This amplification technique can be used in any quantum platform where parametric modulation of the boson channel is possible, enabling exploration of new parameter regimes and enhanced quantum information processing.

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