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Proposal for a Nanomechanical Qubit

机译：纳米力学Qubit的提案

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Mechanical oscillators have been demonstrated with very high quality factors over a wide range of frequencies. They also couple to a wide variety of fields and forces, making them ideal as sensors. The realization of a mechanically based quantum bit could therefore provide an important new platform for quantum computation and sensing. Here, we show that by coupling one of the flexural modes of a suspended carbon nanotube to the charge states of a double quantum dot defined in the nanotube, it is possible to induce sufficient anharmonicity in the mechanical oscillator so that the coupled system can be used as a mechanical quantum bit. However, these results can only be achieved when the device enters the ultrastrong coupling regime. We discuss the conditions for the anharmonicity to appear, and we show that the Hamiltonian can be mapped onto an anharmonic oscillator, allowing us to work out the energy level structure and find how decoherence from the quantum dot and the mechanical oscillator is inherited by the qubit. Remarkably, the dephasing due to the quantum dot is expected to be reduced by several orders of magnitude in the coupled system. We outline qubit control, readout protocols, the realization of a CNOT gate by coupling two qubits to a microwave cavity, and finally how the qubit can be used as a static-force quantum sensor.
机译：在广泛的频率范围内，已经证明了机械振荡器具有非常高的质量因素。他们还致力于各种各样的领域和力量，使其成为传感器的理想选择。因此，实现机械基础量子位可以为量子计算和感测提供重要的新平台。这里，我们表明，通过将悬浮碳纳米管的弯曲模式之一耦合到纳米管中定义的双量子点的充电状态，可以在机械振荡器中引起足够的anharmonicity，从而可以使用耦合系统作为机械量子位。然而，这些结果只能在设备进入超超速耦合状态时实现。我们讨论出现anharmonicity的条件，我们表明汉密尔顿人可以映射到anharmonic振荡器上，允许我们制定能量水​​平结构并找到从量子点和机械振荡器的角度旋转的角度。值得注意的是，由于量子点引起的脱位预计将在耦合系统中减少几个数量级。我们概述量子位控制，读数协议，通过将两个Qubits耦合到微波腔来实现CNOT门，最后如何使用QUBit如何用作静力量子传感器。

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