Perspective on hybrid quantum information processing: A way for large-scale quantum information processing
Perspective on hybrid quantum information processing: A way for large-scale quantum information processing
复制标题
混合量子信息处理视角：大规模量子信息处理的一种方式
DOI：
10.1088/2040-8986/aa72fc
复制
发表时间：
2017
影响因子：
2.1
通讯作者：
A. Furusawa
中科院分区：
文献类型：
--
作者：
P. Marek;P. Zapletal;R. Filip;Y. Hashimoto;T. Toyama;J. Yoshikawa;K. Makino;and A. Furusawa;A. Furusawa
There are two encoding schemes for quantum information processing (QIP). One is called qubit encoding which corresponds to ‘digital’encoding, precisely speaking, quantum information is encoded as a superposition of two orthogonal states. The other is called continuous-variable (CV) encoding which corresponds to ‘analog’encoding, precisely speaking, quantum information is encoded in a wave function with a continuous basis or in amplitude and phase of wave. In some sense, qubit encoding corresponds to a particle picture of quantum mechanics and the CV one corresponds to a wave picture. Both have advantages and disadvantages and grew separately. Here, qubit encoding is widely used, because it has a high-fidelity nature like a digital TV. There are two models of QIP for both encoding schemes. One is the quantum circuit model, where a quantum circuit consists of quantum gates which process input quantum states [1, 2]. The other is the measurement-based model or one-way QIP, where a large-scale entangled state called a cluster state is initially prepared and then we make a measurement and feedforward depending on the desired operations [3, 4].In the case of optical realization of QIP, there are big problems for the quantum circuit model. We need a large-scale quantum circuit for large-scale QIP. It is because an optical qubit is a ‘flying qubit’and we need a real quantum circuit for the processing, which is in sharp contrast to a ‘stationary qubit’like an ion and an atom and they do not need a real quantum circuit for QIP. Also, we have to change the quantum circuit when we make a different QIP. Again, it is because we need a real quantum circuit to process ‘flying qubits’, while the other ‘stationary qubits’ do not need real quantum circuits and we just change the control sequence.
