A5076929991- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Optical Network Technologies
- Quantum Mechanics and Applications
- Advanced Fiber Laser Technologies
- Quantum Computing Algorithms and Architecture
- Laser-Matter Interactions and Applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Atomic and Subatomic Physics Research
- Advanced Photonic Communication Systems
- Physics of Superconductivity and Magnetism
- Mechanical and Optical Resonators
The University of Tokyo
2022-2024
To harness the potential of a quantum computer, information must be protected against error by encoding it into logical state that is suitable for correction. The Gottesman-Kitaev-Preskill (GKP) qubit promising candidate because required multiqubit operations are readily available at optical frequency. date, however, GKP qubits have been demonstrated only mechanical and microwave frequencies. We realized in propagating light telecommunication wavelength verified through homodyne measurements...
Quantum information processors greatly benefit from high clock frequency to fully harnessing the quantum advantages before they get washed out by decoherence. In this pursuit, all-optical systems offer unique due their inherent 100 THz carrier frequency, permitting one develop processors. practice, bandwidth of light sources and measurement devices has been limited MHz range generation rate nonclassical states kHz order -- a tiny fraction what can be achieved. work, we go beyond limitation...
A quantum computer with low-error, high-speed operations and capability for interconnections is required useful computations. logical qubit called Gottesman-Kitaev-Preskill (GKP) in a single Bosonic harmonic oscillator efficient mitigating errors computer. The particularly intriguing prospect of GKP qubits that entangling gates as well syndrome measurements error correction only require efficient, noise-robust linear operations. To date, however, have been demonstrated at mechanical...
Entanglement is a fundamental resource of various optical quantum-information-processing (QIP) applications. Towards high-speed QIP system, entanglement should be encoded in short wavepackets. We report real-time observation ultrafast Einstein-Podolsky-Rosen (EPR) correlation at picosecond timescale continuous-wave (CW) system. Optical phase-sensitive amplification using 6-THz-bandwidth waveguide-optical-parametric amplifier enhances the effective efficiency 70-GHz-bandwidth homodyne...
Quantum information processors benefit from high clock frequencies to fully harness quantum advantages before they are lost decoherence. All-optical systems offer unique benefits due their inherent 100-THz carrier frequency, enabling the development of THz-clock frequency processors. However, bandwidth light sources and measurement devices has been limited MHz range, with nonclassical state generation rates in kHz range. In this study, we demonstrated broadband tomography non-Gaussian states...
Continuous-variable (CV) quantum information processing is a promising candidate for large-scale fault-tolerant computation. However, analysis of CV process relies mostly on direct computation the evolution operators in Heisenberg picture, and features space has yet to be thoroughly investigated an intuitive manner. One key ingredient further exploration computing construction computational model that brings visual intuition new tools analysis. In this paper, we delve into graphical model,...
Non-Gaussian quantum gates are essential components for optical information processing. However, the efficient implementation of practically important multi-mode higher-order non-Gaussian has not been comprehensively studied. We propose a measurement-based method to directly implement general, multi-mode, and using only fixed ancillary states adaptive linear optics. Compared existing methods, our allows more resource-efficient experimentally feasible that various applications in technology,...
Non-Gaussian quantum gates are essential components for optical information processing. However, the efficient implementation of practically important multimode higher-order non-Gaussian has not been comprehensively studied. We propose a measurement-based method to directly implement general, multimode, and using only fixed ancillary states adaptive linear optics. Compared existing methods, our allows more resource-efficient experimentally feasible that various applications in technology,...
We generate and observe optical non-Gaussian states defined in wavepackets of sub-nanosecond time width— O (10 3 ) faster than previous research—using waveguide parametric amplifier made PPLN crystal, enabling ultrafast quantum information processing.
We generate and perform real-time measurement of optical entangled states with 60-GHz bandwidth using waveguide parametric amplifiers homodyne phase sensitive amplification, foreseeing quantum information processing ultrafast clock frequency.
Enabling large-scale and high-speed quantum computation is a key to practical computation. Continuous-variable approach in optical systems offer advantages scalability speed by leveraging their temporal degree of freedom inherent large carrier frequency. In this paper, we investigate the generation manipulation entanglement through time-domain multiplexing approach. By employing multiplexing, generate two-dimensional cluster state—a universal resource for computation—and perform operations...
We present an architecture of optical quantum computation that does not require switches. Our method utilizes teleportation with multimode entanglement making it a scalable is compatible the time-domain technology.