论文标题
通过量子探针对量子的保护性测量
Protective measurement of a qubit by a qubit probe
论文作者
论文摘要
我们研究了用作探针的第二个Qubit对量子的保护性测量。考虑到该模型的考虑是由于其在多等级系统（例如被困离子）中实现实施的可能性。在我们的方案中，有关系统量子标码的任意可观察到的期望值的信息在探针量子量的状态的旋转中编码。我们描述了引起该测量的哈密顿量的结构，并在多种现实条件下分析了所得的动态，例如非芬费小节测量强度，重复测量，探针的不可忽视的内在动力学以及系统的相互作用以及系统的相互作用以及与环境与环境的相互作用。我们在离子陷阱中提出了模型的实验实现。该实验可以使用现有技术进行，并利用已建立的实验方法，用于对量子门的工程和控制，用于量子门和旋转系统的量子模拟。
We study the protective measurement of a qubit by a second qubit acting as a probe. Consideration of this model is motivated by the possibility of its experimental implementation in multiqubit systems such as trapped ions. In our scheme, information about the expectation value of an arbitrary observable of the system qubit is encoded in the rotation of the state of the probe qubit. We describe the structure of the Hamiltonian that gives rise to this measurement and analyze the resulting dynamics under a variety of realistic conditions, such as noninfinitesimal measurement strengths, repeated measurements, non-negligible intrinsic dynamics of the probe, and interactions of the system and probe qubits with an environment. We propose an experimental realization of our model in an ion trap. The experiment may be performed with existing technology and makes use of established experimental methods for the engineering and control of Hamiltonians for quantum gates and quantum simulations of spin systems.
