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Quantum Nondemolition Gate Operations and Measurements in Real Time on Fluctuating Signals
Yu Shiozawa, Jun-ichi Yoshikawa, Shota Yokoyama +10
We demonstrate an optical quantum nondemolition (QND) interaction gate with a bandwidth of about 100 MHz. Employing this gate, we are able to perform QND measurements in real time…
Universal quantum computation with temporal-mode bilayer square lattices
Rafael N. Alexander, Shota Yokoyama, Akira Furusawa +1
We propose an experimental design for universal continuous-variable quantum computation that incorporates recent innovations in linear-optics-based continuous-variable cluster stat…
Heralded creation of photonic qudits from parametric down conversion using linear optics
Jun-ichi Yoshikawa, Marcel Bergmann, Peter van Loock +7
We propose an experimental scheme to generate, in a heralded fashion, arbitrary quantum superpositions of two-mode optical states with a fixed total photon number based on weak…
Generation of highly pure Schrödinger's cat states and real-time quadrature measurements via optical filtering
Warit Asavanant, Kota Nakashima, Yu Shiozawa +2
Until now, Schrödinger's cat states are generated by subtracting single photons from the whole bandwidth of squeezed vacua. However, it was pointed out recently that the achievable…
General implementation of arbitrary nonlinear quadrature phase gates
Petr Marek, Radim Filip, Hisashi Ogawa +4
We propose general methodology of deterministic single-mode quantum interaction nonlinearly modifying single quadrature variable of a continuous variable system. The methodology is…
Purification of photon subtraction from continuous squeezed light by filtering
Jun-ichi Yoshikawa, Warit Asavanant, Akira Furusawa
Photon subtraction from squeezed states is a powerful scheme to create good approximation of so-called Schrödinger cat states. However, conventional continuous-wave-based methods a…