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International Conference on Solid State Devices and Materials (SSDM)

High-Speed Emulation of the Quantum Computing Based on Logic Operations

Kosuke Saito, Yasufumi Suzuki, Minoru Fujishima, Koichiro Hoh

Published Sep 18, 2002• 2 citations
Publisher
DOI
10.7567/ssdm.2002.p1-5

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A high-speed and large-scale processor dedicated to quantum computing is proposed, which has the minimum operation function needed for execution of a quantum algorithm. In this processor, the probability amplitudes determined by the states of the quantum bits in the quantum computer are described using only one bit, and we named it a logic quantum processor. It is found that for this processor an execution speed 275 times higher than that of a software simulation is obtained when the processor executing the quantum algorithm for 16 qubit has been implemented in a FPGA. As an example application, it is shown that the processor can solve the satisfiability problem and that it can also simulate the decoherence in the quantum computer at high speed.
A quantum computer has been the focus of considerable attention since it realizes a much higher operating speed than conventional computers. However, there are many important issues regarding algorithms as well as hardware in the realization of a quantum computer. To realize the calculation speed of a quantum computer, several quantum-computing emulators utilizing parallel operation using integrated circuits were fabricated. Consequently, an emulator of 75 quantum bits was realized, and the feasibility of a high-speed quantum-computing emulator using integrated circuits has been proved.
A novel complementary-metal-oxide-semiconductor (CMOS) processor labelled quantum-circuit processor (QCP) for the high-performance emulation of quantum computing is presented. The QCP performs the emulation of the calculation performed in the quantum circuit by simple matrix calculations based on single-instruction-stream-multiple-data-stream (SIMD) parallel processing. Using the parallel operation of an enormous number of devices in LSI, it executes quantum algorithms at a speed comparable to that of the quantum computer. A 5-qubit processor was implemented using a programmable logic device (PLD), and the quantum Fourier transformation was demonstrated by this processor.