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Generation and Suppression of Decoherence in Artificial Environment for Qubit System
Yasushi Kondo, Mikio Nakahara, Shogo Tanimura +3
It is known that a quantum system with finite degrees of freedom can simulate a composite of a system and an environment if the state of the hypothetical environment is randomized…
Artificial Decoherence and its Suppression in NMR Quantum Computer
Yasushi Kondo, Mikio Nakahara, Shogo Tanimura
Liquid-state NMR quantum computer has demonstrated the possibility of quantum computation and supported its development. Using NMR quantum computer techniques, we observed phase de…
Hamiltonian of Homonucleus Molecules for NMR Quantum Computing
Yasushi Kondo, Mikio Nakahara, Kazuya Hata +1
We derive the Hamiltonian in the rotating frame for NMR quantum computing with homonucleus molecules as its computational resource. The Hamiltonian thus obtained is different from…
Warp-Drive Quantum Computation
Mikio Nakahara, Juha J. Vartiainen, Yasushi Kondo +2
Recently it has been shown that time-optimal quantum computation is attained by using the Cartan decomposition of a unitary matrix. We extend this approach by noting that the unita…
Demonstrating quantum algorithm acceleration with NMR quantum computer
Mikio Nakahara, Yasushi Kondo, Kazuya Hata +1
In general, a quantum circuit is constructed with elementary gates, such as one-qubit gates and CNOT gates. It is possible, however, to speed up the execution time of a given circu…
Exact solutions of the isoholonomic problem and the optimal control problem in holonomic quantum computation
Shogo Tanimura, Mikio Nakahara, Daisuke Hayashi
The isoholonomic problem in a homogeneous bundle is formulated and solved exactly. The problem takes a form of a boundary value problem of a variational equation. The solution is a…