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Issue No.02 - February (2009 vol.58)
pp: 238-250
Chuan-Ching Sue , National Cheng Kung University, Tainan
This study develops a quantum switching device with fully nonblocking properties. Although previous studies have also presented quantum-based solutions for the blocking problem, the proposed schemes are characterized by an increased packet loss, a large number of quantum SWAP gates and an increased propagation delay time complexity. The current study overcomes these drawbacks by designing an N \times N fully nonblocking quantum switch, in which the packet payload is passed through quantum SWAP gates while the packet header is passed through quantum control gates designed by applying a modified quantum Karnaugh mapping method. The allocation of quantum SWAP gates to the different layers within the switch is solved using a Perfect Matching in Complete Graph (PMiCG) algorithm with a time complexity of {\rm O}(N!/(2^{N/2}(N/2)!)). A symmetry-based heuristic method is proposed to reduce the time complexity of the search process for all the perfect matching pairs to a time complexity of {\rm O}(N^{2}). The performance of the proposed quantum switch is compared with that of a quantum self-routing packet switch and a quantum switching/quantum merge sorting scheme, respectively, in terms of the hardware complexity, the propagation delay time complexity, the auxiliary qubit complexity, and the packet loss probability.
Fully meshed, quantum computer, nonblocking, SWAP gate, quantum Karnaugh mapping.
Chuan-Ching Sue, "An Enhanced Universal N x N Fully Nonblocking Quantum Switch", IEEE Transactions on Computers, vol.58, no. 2, pp. 238-250, February 2009, doi:10.1109/TC.2008.161
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