Dynamical Decoupling of a Geometric Qubit
Dynamical Decoupling of a Geometric Qubit
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DOI：
10.1103/physrevapplied.12.051001
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发表时间：
2019-11
影响因子：
4.6
通讯作者：
Y. Sekiguchi;Yusuke Komura;H. Kosaka
中科院分区：
文献类型：
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作者：
Y. Sekiguchi;Yusuke Komura;H. Kosaka
量子比特或量子比特通过与不可控的环境纠缠而自然地退相干。因此，需要动态解耦以通过周期性地反转量子位基底来将量子位从环境中解开，但这会导致旋转误差累积。传统的量子比特在SU（2）二能级系统中旋转，而在V形SU（3）三能级系统的简并子空间中定义的几何量子比特通过第三辅助能级进行几何旋转以获得几何相位。我们在这里证明，简单地通过引入失谐，动态解耦的几何量子位的自旋三重态电子在金刚石中的氮空位中心，可以自发地抑制误差积累。几何动力学解耦扩展的相干时间的几何量子位高达1.9 ms，限制的弛豫时间，在室温下与128个解耦门。我们的技术开辟了一条完整量子存储器的路线，可用于需要顺序操作的各种量子应用
Quantum bits or qubits naturally decohere by becoming entangled with uncontrollable environments. Dynamical decoupling is thereby required to disentangle qubits from an environment by periodically reversing the qubit bases, but this causes rotation error to accumulate. Whereas a conventional qubit is rotated within the SU(2) two-level system, a geometric qubit defined in the degenerate subspace of a V-shaped SU(3) three-level system is geometrically rotated via the third ancillary level to acquire a geometric phase. We here demonstrate that, simply by introducing detuning, the dynamical decoupling of the geometric qubit on a spin triplet electron in a nitrogen-vacancy center in diamond can be made to spontaneously suppress error accumulation. The geometric dynamical decoupling extends the coherence time of the geometric qubit up to 1.9 ms, limited by the relaxation time, with 128 decoupling gates at room temperature. Our technique opens a route to holonomic quantum memory for use in various quantum applications requiring sequential operations