State selective detection of hyperfine qubits
State selective detection of hyperfine qubits
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DOI：
10.1088/0953-4075/48/7/075101
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
S. Wölk;C. Piltz;T. Sriarunothai;C. Wunderlich
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文献类型：
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作者：
S. Wölk;C. Piltz;T. Sriarunothai;C. Wunderlich
为了忠实地检测使用例如捕获离子或原子实现的单个二态量子系统（量子位）的状态，共振荧光的状态选择性散射已经得到很好的建立。读取该测量值并分配状态的最简单方法是阈值方法。可以通过使用更先进的检测方法来减少检测误差，例如时间分辨方法（Myerson et al 2008 Phys. Rev. Lett. 100 200502）或π脉冲检测方法（Hemmerling et al 2012 New. J. Phys. 14 023043）。这些方法被引入到在测量过程中具有单一可能状态变化的量子位。然而，存在许多量子位，例如 171 Yb + ?> 的超精细量子位，其中可能发生多种状态变化。为了减少此类量子位的检测误差，我们开发了此类量子位的时间分辨方法和 π 脉冲检测方法的推广。我们使用 171 Yb + ?> 的超精细量子位在数值模拟和实验中展示了这些广义检测方法的优势。这里开发的广义检测方法可以以有效的方式实现，使得具有改进的保真度的实验实时状态辨别成为可能。
In order to faithfully detect the state of an individual two-state quantum system (qubit) realized using, for example, a trapped ion or atom, state selective scattering of resonance fluorescence is well established. The simplest way to read out this measurement and assign a state is the threshold method. The detection error can be decreased by using more advanced detection methods like the time-resolved method (Myerson et al 2008 Phys. Rev. Lett. 100 200502) or the π-pulse detection method (Hemmerling et al 2012 New. J. Phys. 14 023043). These methods were introduced to qubits with a single possible state change during the measurement process. However, there exist many qubits like the hyperfine qubit of 171 Yb + ?> where several state change are possible. To decrease the detection error for such qubits, we develop generalizations of the time-resolved method and the π-pulse detection method for such qubits. We show the advantages of these generalized detection methods in numerical simulations and experiments using the hyperfine qubit of 171 Yb + ?> . The generalized detection methods developed here can be implemented in an efficient way such that experimental real time state discrimination with improved fidelity is possible.