580 citations · 983 across the 5 of their papers we have counts for
5 papers · 1 filter
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…
Ultra-Large-Scale Continuous-Variable Cluster States Multiplexed in the Time Domain
Shota Yokoyama, Ryuji Ukai, Seiji C. Armstrong +7
Quantum computers promise ultrafast performance of certain tasks. Experimentally appealing, measurement-based quantum computation (MBQC) requires an entangled resource called a clu…
Generation of large-amplitude coherent-state superposition via ancilla-assisted photon-subtraction
Hiroki Takahashi, Kentaro Wakui, Shigenari Suzuki +4
We propose and demonstrate a novel method to generate a large-amplitude coherent-state superposition (CSS) via ancilla-assisted photon-subtraction. The ancillary mode induces quant…
7 dB quadrature squeezing at 860 nm with periodically-poled KTiOPO4
Shigenari Suzuki, Hidehiro Yonezawa, Fumihiko Kannari +2
We observed -7.2 dB quadrature squeezing at 860 nm by using a sub-threshold continuous-wave pumped optical parametric oscillator with a periodically-poled KTiOPO4 crystal as a nonl…
Practical purification scheme for decohered coherent-state superpositions via partial homodyne detection
Shigenari Suzuki, Masahiro Takeoka, Masahide Sasaki +2
We present a simple protocol to purify a coherent-state superposition that has undergone a linear lossy channel. The scheme constitutes only a single beam splitter and a homodyne d…