11 citations · 12 across the 10 of their papers we have counts for
10 papers
Efficient Quantum Circuit Construction of Controlled Time-Evolution for Arbitrary Pauli-Sum Hamiltonians
Shintaro Fujiwara, Naoki Yamamoto, Naoki Ishikawa
Controlled time-evolution circuits select forward or backward Hamiltonian time evolution according to the state of an ancilla qubit. They are fundamental building blocks in quantum…
Penalty-Free Two-Step Optimization of Higher-Order Ising Problems for Two-Dimensional Line-Controlled RIS
Tasuku Okamoto, Naoki Ishikawa, Daisuke Kitayama +5
Reconfigurable intelligent surfaces (RISs) are often assumed to allow continuous phase control over all elements, leading to hardware cost that scales with the number of elements.…
Scalable and Near-Optimal Discrete Phase Shift Optimization for Reconfigurable Intelligent Surfaces with Over 20,000 Elements
Yuto Hama, Daisuke Kitayama, Kensuke Inaba +4
This paper proposes a novel optimization framework for discrete phase shifts of a reconfigurable intelligent surface (RIS) using a coherent Ising machine (CIM). Unlike conventional…
Quantum-Accelerated Wireless Communications: Concepts, Connections, and Implications
Naoki Ishikawa, Giuseppe Thadeu Freitas de Abreu, Petar Popovski +1
Quantum computing is poised to redefine the algorithmic foundations of communication systems. While quantum superposition and entanglement enable quadratic or exponential speedups…
Quantum Speedup for Polar Maximum Likelihood Decoding
Shintaro Fujiwara, Naoki Ishikawa
Conventional decoding algorithms for polar codes strive to balance achievable performance and computational complexity in classical computing. While maximum likelihood (ML) decodin…
Grover Adaptive Search for the Higher-Order Formulation of Quadratic Assignment Problems
Taku Mikuriya, Shintaro Fujiwara, Kein Yukiyoshi +2
We demonstrate that the search space of the quadratic assignment problem (QAP), known as an NP-hard combinatorial optimization problem, can be reduced using Grover adaptive search…
Grover Adaptive Search with Spin Variables
Shintaro Fujiwara, Naoki Ishikawa
This paper presents a novel approach to Grover adaptive search (GAS) for a combinatorial optimization problem whose objective function involves spin variables. While the GAS algori…
Grover Adaptive Search for Maximum Likelihood Detection of Generalized Spatial Modulation
Kein Yukiyoshi, Taku Mikuriya, Hyeon Seok Rou +2
We propose a quantum-assisted solution for the maximum likelihood detection (MLD) of generalized spatial modulation (GSM) signals. Specifically, the MLD of GSM is first formulated…
Quantum Speedup of the Dispersion and Codebook Design Problems
Kein Yukiyoshi, Taku Mikuriya, Hyeon Seok Rou +2
We propose new formulations of max-sum and max-min dispersion problems that enable solutions via the Grover adaptive search (GAS) quantum algorithm, offering quadratic speedup. Dis…
AFDM Chirp-Permutation-Index Modulation with Quantum-Accelerated Codebook Design
Hyeon Seok Rou, Kein Yukiyoshi, Taku Mikuriya +2
We describe a novel index modulation (IM) scheme exploiting a unique feature of the recently proposed affine frequency division multiplexing (AFDM) in doubly-dispersive (DD) channe…