A5046721390- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Advanced X-ray Imaging Techniques
- Quantum Computing Algorithms and Architecture
- Crystallography and Radiation Phenomena
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Accelerators and Free-Electron Lasers
- Astrophysical Phenomena and Observations
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Laser Applications in Dentistry and Medicine
- Quantum Electrodynamics and Casimir Effect
- Radiation Effects and Dosimetry
- Plasma Diagnostics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Cancer Diagnosis and Treatment
- Magnetic properties of thin films
- Soft tissue tumors and treatment
- Dental Implant Techniques and Outcomes
- Geophysical and Geoelectrical Methods
The University of Tokyo
2013-2024
Institute of Particle Physics
2017
We report the first results of a search for real photon-photon scattering using X rays. A novel system is developed to split and collide X-ray pulses by applying interferometric techniques. total $6.5\times10^{5}$ (each containing about $10^{11}$ photons) from an Free-Electron Laser are injected into system. No scattered events observed, upper limit $1.7\times 10^{-24}$ ${\rm m^{2}}$ (95% C.L.) obtained on elastic cross section at 6.5 keV.
A search for paraphotons, or hidden U(1) gauge bosons, is performed using an intense X-ray beamline at SPring-8. "Light Shining through a Wall" technique used in this search. No excess of events above background observed. stringent constraint obtained on the photon–paraphoton mixing angle, χ<8.06×10−5 (95% C.L.) 0.04eV<mγ′<26keV.
A nonlinear interaction between photons is observed in a process that involves charge sources. To observe this vacuum, there are growing number of theoretical and experimental studies. This may contain exotic contribution from new physics beyond the Standard Model particle physics, probed by experiments using high-power laser or high-field magnet, more recently an X-ray Free-Electron Laser (XFEL). Here, we review present status our testing various vacuum processes. We describe four with...
We report a search for photon-photon elastic scattering in vacuum the X-ray region at an energy center of mass system \omega_{cms} =6.5 keV which QED cross section is \sigma_{QED} =2.5 \times 10^{-47} m^2. An beam provided by SACLA Free Electron Laser split and two beamlets are made to collide right angle, with total integrated luminosity (1.24 \pm 0.08) 10^{28} m^{-2}. No signal X rays from that satisfy correlation between angle were detected. obtain 95% C.L. upper limit 1.9 10^{-27} m^2...
We propose a novel dark matter detection method utilizing the excitation of superconducting transmon qubits. Assuming hidden photon mass $O(10)\text{ }\text{ }\mathrm{\ensuremath{\mu}}\mathrm{eV}$, classical wave-matter oscillation induces an effective ac electric field via small kinetic mixing with ordinary photon. This serves as coherent drive for qubit when it is resonant, evolving from ground state towards first-excited state. evaluate rate such evolution and observable excitations in...
We report on new results of a search for two-photon interaction with axionlike particles (ALPs). The experiment was carried out at synchrotron radiation facility using "light shining through wall (LSW)" technique. For this purpose, we have developed novel pulsed-magnet system, composed multiple racetrack-magnets and transportable power supply. It produces fields about 10 T over 0.8 m high repetition rate 0.2 Hz yields method probing vacuum intensity fields. data obtained total 27,676 pulses...
We report on the first results from a new dish antenna search for hidden photon dark matter (HPDM) in meV mass region. A double mirror system composed of plane and parabolic is designed to convert HPDMs into photons focused receiver. In this phase 1 experiment we obtain an upper limit photon-HP kinetic mixing $\chi \lesssim 10^{-8}$ range $0.67-0.92\,{\rm meV}$ using conventional mm-wave technology with room-temperature receiver small-sized system.
We propose a novel method to significantly enhance the signal rate in qubit-based dark matter detection experiments with help of quantum interference. Various sensors possess ideal properties for detecting wavelike matter, and qubits, commonly employed computers, are excellent candidates detectors. demonstrate that, by designing an appropriate circuit manipulate scales proportionally n_{q}^{2}, n_{q} being number sensor rather than linearly n_{q}. Consequently, substantial significant...
Quantum electrodynamics predicts x-ray diffractions under a high-intensity laser field via virtual charged particles, and this phenomenon is called as vacuum diffraction (VD). In paper, we derive new formula to describe VD in head-on collision geometry of an XFEL pulse pulse. A wavefront curvature the newly considered formula. With formula, also discuss effect on signals based realistic parameters at SACLA facility.
Quantum error correction is a crucial step beyond the current noisy-intermediate-scale quantum device towards fault-tolerant computing. However, most of corrections ever demonstrated rely on post-selection events or post-correction states, based measurement results repeatedly recorded during circuit execution. On other hand, real-time supposed to be performed through classical feedforward data qubits. It provides unavoidable latency from conditional electronics that would limit scalability...
We propose a direct axion dark matter (DM) search using superconducting transmon quantum bits (qubits) as sensors. With an external magnetic field applied, DM generates oscillating electric field, which causes the excitation of qubit. Such can be regarded signal DM. provide theoretical consideration process qubits, taking into account effects shielding cavity surrounding and estimate rate for detection. also discuss enhancement by resonance entangled sensors realized circuit. Combining these...
Spin-wave (SW) amplification utilizing the spin-transfer torques induced by spin-polarized current is numerically investigated. The drives magnetic domain wall and creates an effective moving media for SWs. When polarized density sufficiently large speed of domain-wall gets faster than velocity SW. Combined with a spatially inhomogeneous profile prepared bottleneck structure, peculiar SW cavity formed. As length changed, transmission reflection signal SWs show resonant feature. We present...
We propose a direct axion dark matter (DM) search using superconducting transmon qubits as quantum sensors. With an external magnetic field applied, DM generates oscillating electric which causes the excitation of qubit; such can be regarded signal DM. provide theoretical consideration process taking into account effects shielding cavity surrounding and estimate rate for detection. also discuss enhancement by resonance entangled sensors realized circuit. Combining these two effects, we reach...
We propose a novel method to significantly enhance the signal rate in qubit-based dark matter detection experiments with help of quantum interference. Various sensors possess ideal properties for detecting wave-like matter, and qubits, commonly employed computers, are excellent candidates detectors. demonstrate that, by designing an appropriate circuit manipulate scales proportionally $n_{\rm q}^2$, q}$ being number sensor rather than linearly q}$. Consequently, substantial significant...
Quantum electrodynamics expects the vacuum is transformed into a polarizable medium under an intense electromagnetic fi eld. This polarization results in various macroscopic phenomena, such as birefringence, diffraction, and so on. An x-ray free electron laser (XFEL) powerful probe to detect these phenomena thanks its short wavelength high peak brilliance. We are searching for birefringence diffraction using XFEL PW class optical lasers at SACLA. In this paper, we present overview current...
We propose a novel dark matter detection method utilizing the excitation of superconducting transmon qubits. Assuming hidden photon mass $O(10)\ \mu{\rm eV}$, classical wave-matter oscillation induces an effective ac electric field via small kinetic mixing with ordinary photon. This serves as coherent drive for qubit when it is resonant, evolving from ground state towards first-excited state. evaluate rate such evolution and observable excitations in measurements, well search sensitivity to...
Entangling gates in superconducting quantum computers suffer from imperfection of control and relaxation qubits. The Toffoli gate, essential to various algorithms certain fast error correction schemes, represents a particular challenge, as it is decomposed into at least six two-qubit gates, whose errors accrue on top the increased probability qubit due long gate time. While possible significantly reduce depth by exploiting three-level, i.e., qutrit states internally, existing methods are...