Abstract
In this chapter, we briefly review one-way quantum computation as well as the background of this thesis. A measurement-based model of quantum computation, referred to as “one-way quantum computation”, is proposed as an alternative to the standard circuit model of quantum computation. One-way quantum computation can be considered as an application of quantum teleportation to quantum computation. Once a sufficiently large entangled state called a “cluster state” is prepared in advance, an arbitrary quantum computation can be implemented by a succession of measurements on the cluster state. Recently, generation of up to six-mode cluster states and subsequent demonstrations of single-mode Gaussian operations are reported. In this thesis, we show the first successful demonstration of two-mode Gaussian operations in one-way quantum computation. As a next step for many-mode operations, we discuss how one-way quantum computation can be implemented using temporal-mode cluster states.
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- 1.
To be precise, Fig. 1.4 shows the teleportation-based input coupling scheme (Sect. 5.3.3), where both measurements are homodyne measurements. A homodyne measurement has one DOF: the relative phase \(\theta \) between the signal beam and the local oscillator beam. Thus, Fig. 1.4 has two DOF. In general, we can implement a transformation with multiple DOF using an elementary one-mode one-way gate (Sect. 4.2.3) by choosing a complicated measurement. However, we usually assume that we construct a large-scale quantum computation by concatenating several kinds of elementary gates with limited DOF. Therefore, the total DOF of operations still increase as well by concatenating elementary gates.
- 2.
Since both optical DV and CV systems have merits and demerits of their own, a hybrid scheme is also being studied [31], where DV gates are implemented using optical CV setups. It is thought that the imperfections of quantum states may be compensated by limiting the dimension of computational bases.
- 3.
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Ukai, R. (2015). Introduction. In: Multi-Step Multi-Input One-Way Quantum Information Processing with Spatial and Temporal Modes of Light. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55019-8_1
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