64 citations · 202 across the 9 of their papers we have counts for
9 papers
Extending the PZT bandwidth of an optical interferometer by suppressing resonance using a high dimensional IIR filter implemented on an FPGA
Masanori Okada, Takahiro Serikawa, James Dannatt +4
This paper considers the application of FPGA-based IIR filtering to increase the usable bandwidth of a piezoelectric transducer used in optical phase locking. We experimentally per…
Generation and measurement of a squeezed vacuum up to 100 MHz at 1550 nm with a semi-monolithic optical parametric oscillator designed towards direct coupling with waveguide modules
Naoto Takanashi, Wataru Inokuchi, Takahiro Serikawa +1
We report generation and measurement of a squeezed vacuum from a semi-monolithic Fabry-Perot optical parametric oscillator (OPO) up to 100 MHz at 1550 nm. The output coupler of the…
Complete temporal mode characterization of non-Gaussian states by dual homodyne measurement
Kan Takase, Masanori Okada, Takahiro Serikawa +3
Optical quantum states defined in temporal modes, especially non-Gaussian states like photon-number states, play an important role in quantum computing schemes. In general, the tem…
Excess Loss in Homodyne Detection Originating from Distributed Photocarrier Generation in Photodiodes
Takahiro Serikawa, Akira Furusawa
The distributed absorption of photons in photodiodes induces an excess noise in continuous-wave photodetection above the transit-time roll-off frequency. We show that it can be tre…
Schrödinger's cat in an optical sideband
Takahiro Serikawa, Jun-ichi Yoshikawa, Shuntaro Takeda +4
We propose a method to subtract a photon from a double sideband mode of continuous-wave light. The central idea is to use phase modulation as a frequency sideband beamsplitter in t…
500MHz resonant photodetector for high-quantum-effciency, low-noise homodyne measurement
Takahiro Serikawa, Akira Furusawa
We design and demonstrate a resonant-type differential photodetector for low-noise quantum homodyne measurement at 500MHz optical sideband with 17MHz of bandwidth. By using a micro…
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…
Characterization of entangling properties of quantum measurement via two-mode quantum detector tomography using coherent state probes
Shota Yokoyama, Nicola Dalla Pozza, Takahiro Serikawa +5
Entangled measurement is a crucial tool in quantum technology. We propose a new entanglement measure of multi-mode detection, which estimates the amount of entanglement that can be…
Creation and Measurement of Broadband Squeezed Vacuum from a Ring Optical Parametric Oscillator
Takahiro Serikawa, Jun-ichi Yoshikawa, Kenzo Makino +1
We report a 65MHz-bandwidth triangular-shaped optical parametric oscillator (OPO) for squeezed vacuum generation at 860nm. The triangle structure of our OPO enables the round-trip…