Quantum circuits for an effective pure state in NMR quantum computer
Yoshiyuki Mori, Ryuichi Sawae, Minaru Kawamura, Toshio Sakata, Kenichi Takarabe · International Journal of Quantum Chemistry · 2005
Abstract In nuclear magnetic resonance (NMR) quantum computing systems, it is very important to prepare an effective pure state rather than a true pure state. Our main objective is to present a general algorithm that provides quantum circuits for preparing an effective pure state from any mixed state, consisting only of controlled‐not (CNOT) quantum gates for homonuclear spin systems. Our algorithm is based on the product operator approach and could be applicable to NMR quantum computing systems with more than eight qubits. Optimization of the number of controlled‐not quantum gates is discussed. © 2005 Wiley Periodicals, Inc. Int J Quantum Chem, 2005