580 citations · 1.3k across the 18 of their papers we have counts for
17 papers · 1 filter
Experimental implementation of continuous-variable QAOA on a quad-rail lattice cluster state
Shota Yokoyama, Atsushi Sakaguchi, Jun-ichi Yoshikawa +6
We experimentally demonstrate the continuous-variable quantum approximate optimization algorithm (CV-QAOA) for multi-variable problems and multiple QAOA depths using a measurement-…
Tracking Quantum Dynamics in an Optical Cavity for Recovering Purity and Squeezing via Quantum State Smoothing
Shota Yokoyama, Kiarn T. Laverick, David McManus +6
Tracking the dynamics of a quantum system is conventionally achieved by monitoring the system continuously in time and filtering the information contained in measurement records vi…
Configuration design of multimode Gaussian operations on continuous-variable quad-rail lattice cluster states
Jun-ichi Yoshikawa, Warit Asavanant, Hironari Nagayoshi +4
Continuous-variable quad-rail lattice cluster states enable flexible quantum circuit design on their two-dimensional structure. However, how to combine basic operations on the quad…
A full-stack analog optical quantum computing platform with one hundred inputs
Shota Yokoyama, Atsushi Sakaguchi, Warit Asavanant +11
Optical technology is a highly promising platform for quantum computing due to its enormous potential for large-scale, ultrafast computation. However, realizing a programmable and…
On the regularization and optimization in quantum detector tomography
Shuixin Xiao, Yuanlong Wang, Jun Zhang +4
Quantum detector tomography (QDT) is a fundamental technique for calibrating quantum devices and performing quantum engineering tasks. In this paper, we utilize regularization to i…
One-hundred step measurement-based quantum computation multiplexed in the time domain with 25 MHz clock frequency
Warit Asavanant, Baramee Charoensombutamon, Shota Yokoyama +8
Among various approaches toward quantum computation, measurement-based quantum computation (MBQC) multiplexed in time domain is currently a promising method for addressing the need…
Fault-tolerant Coherent H-infinity Control for Linear Quantum Systems
Yanan Liu, Daoyi Dong, Ian R. Petersen +4
Robustness and reliability are two key requirements for developing practical quantum control systems. The purpose of this paper is to design a coherent feedback controller for a cl…
Feasibility study of a coherent feedback squeezer
Shota Yokoyama, Daniel Peace, Warit Asavanant +6
We investigate a coherent feedback squeezer that uses quantum coherent feedback (measurement-free) control. Our squeezer is simple, easy to implement, robust to the gain fluctuatio…
Two-stage Estimation for Quantum Detector Tomography: Error Analysis, Numerical and Experimental Results
Yuanlong Wang, Shota Yokoyama, Daoyi Dong +3
Quantum detector tomography is a fundamental technique for calibrating quantum devices and performing quantum engineering tasks. In this paper, a novel quantum detector tomography…
Time-Domain Multiplexed 2-Dimensional Cluster State: Universal Quantum Computing Platform
Warit Asavanant, Yu Shiozawa, Shota Yokoyama +8
Quantum computation promises applications that are thought to be impossible with classical computation. To realize practical quantum computation, the following three properties wil…
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…
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…
Demonstration of a fully tuneable entangling gate for continuous-variable one-way quantum computation
Shota Yokoyama, Ryuji Ukai, Seiji C. Armstrong +3
We introduce a fully tuneable entangling gate for continuous-variable one-way quantum computation. We present a proof-of-principle demonstration by propagating two independent opti…
Nonlocal quantum gate on quantum continuous variables with minimum resources
Shota Yokoyama, Ryuji Ukai, Jun-ichi Yoshikawa +3
We experimentally demonstrate, with an all-optical setup, a nonlocal deterministic quantum non-demolition interaction gate applicable to quantum states at nodes separated by a phys…
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…
Demonstration of a Controlled-Phase Gate for Continuous-Variable One-Way Quantum Computation
Ryuji Ukai, Shota Yokoyama, Jun-ichi Yoshikawa +2
We experimentally demonstrate a controlled-phase gate for continuous variables in a fully measurement-based fashion. In our scheme, the two independent input states of the gate, en…