Yosuke Takasu
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View article: Observation of slow relaxation due to Hilbert space fragmentation in strongly interacting Bose-Hubbard chains
Observation of slow relaxation due to Hilbert space fragmentation in strongly interacting Bose-Hubbard chains Open
While isolated quantum systems generally thermalize after long-time evolution, there are several exceptions defying thermalization. A notable mechanism of this nonergodicity is the Hilbert space fragmentation (HSF), where the Hamiltonian m…
View article: Plane-selective manipulations of nuclear spin qubits in a three-dimensional optical tweezer array
Plane-selective manipulations of nuclear spin qubits in a three-dimensional optical tweezer array Open
One of the central challenges for a practical fault-tolerant quantum computer is scalability. A three-dimensional structure of optical tweezer arrays offers the potential for scaling up neutral atom processors. However, coherent operations…
View article: Plane-selective manipulations of nuclear spin qubits in a three-dimensional optical tweezer array
Plane-selective manipulations of nuclear spin qubits in a three-dimensional optical tweezer array Open
One of the central challenges for a practical fault-tolerant quantum computer is scalability. A three-dimensional structure of optical tweezer arrays offers the potential for scaling up neutral atom processors. However, coherent operations…
View article: Observation of slow relaxation due to Hilbert space fragmentation in strongly interacting Bose-Hubbard chains
Observation of slow relaxation due to Hilbert space fragmentation in strongly interacting Bose-Hubbard chains Open
While isolated quantum systems generally thermalize after long-time evolution, there are several exceptions defying thermalization. A notable mechanism of such nonergodicity is the Hilbert space fragmentation (HSF), where the Hamiltonian m…
View article: Hybrid Atom Tweezer Array of Nuclear Spin and Optical Clock Qubits
Hybrid Atom Tweezer Array of Nuclear Spin and Optical Clock Qubits Open
While data qubits with a long coherence time are essential for the storage of quantum information, ancilla qubits are pivotal in quantum error correction (QEC) for fault-tolerant quantum computing. The recent development of optical tweezer…
View article: Development of a high-power ultraviolet laser system and observation of fast coherent Rydberg excitation of ytterbium
Development of a high-power ultraviolet laser system and observation of fast coherent Rydberg excitation of ytterbium Open
We present the development of a high-power ultraviolet laser system operating at a wavelength of 325 nm for Rydberg excitation from the ${}^3\mathrm{P}_2$ state of ytterbium. Utilizing a two-stage frequency doubling scheme, we achieved an …
View article: A hybrid atom tweezer array of nuclear spin and optical clock qubits
A hybrid atom tweezer array of nuclear spin and optical clock qubits Open
While data qubits with a long coherence time are essential for the storage of quantum information, ancilla qubits are pivotal in quantum error correction (QEC) for fault-tolerant quantum computing. The recent development of optical tweezer…
View article: Gain engineering and topological atom laser in synthetic dimensions
Gain engineering and topological atom laser in synthetic dimensions Open
In the recent rapid progress of quantum technology, controlling quantum states has become an important subject of study. Of particular interest is the control of open quantum systems, where the system of interest couples to the environment…
View article: Exploring the Strongly-Interacting Regime of Effective Multi-Body Interactions in a Trapped Ultracold Atom System
Exploring the Strongly-Interacting Regime of Effective Multi-Body Interactions in a Trapped Ultracold Atom System Open
A two-body interaction or force between quantum particles is ubiquitous in nature, and the microscopic description in terms of the bare two-body interaction is the basis for quantitatively describing interacting few- and many-body systems.…
View article: High-resolution Spectroscopy and Single-photon Rydberg Excitation of Reconfigurable Ytterbium Atom Tweezer Arrays Utilizing a Metastable State
High-resolution Spectroscopy and Single-photon Rydberg Excitation of Reconfigurable Ytterbium Atom Tweezer Arrays Utilizing a Metastable State Open
We present an experimental system for Rydberg tweezer arrays with ytterbium\n(Yb) atoms featuring internal state manipulation between the ground ${}^1$S$_0$\nand the metastable ${}^3$P$_2$ states, and single-photon excitation from the\n${}…
View article: Observation of the Sign Reversal of the Magnetic Correlation in a Driven-Dissipative Fermi Gas in Double Wells
Observation of the Sign Reversal of the Magnetic Correlation in a Driven-Dissipative Fermi Gas in Double Wells Open
We report the observation of the sign reversal of the magnetic correlation from antiferromagnetic to ferromagnetic in a dissipative Fermi gas in double wells, utilizing the dissipation caused by on-site two-body losses in a controlled mann…
View article: Observation of Nonlinearity of Generalized King Plot in the Search for New Boson
Observation of Nonlinearity of Generalized King Plot in the Search for New Boson Open
We measure isotope shifts for neutral Yb isotopes on an ultranarrow optical clock transition ^{1}S_{0}−^{3}P_{0} with an accuracy of a few hertz. Combined with one of the recently reported isotope-shift measurements of Yb^{+} on two optica…
View article: SU(3) truncated Wigner approximation for strongly interacting Bose gases
SU(3) truncated Wigner approximation for strongly interacting Bose gases Open
We develop and utilize the SU(3) truncated Wigner approximation (TWA) in order to analyze far-from-equilibrium quantum dynamics of strongly interacting Bose gases in an optical lattice. Specifically, we explicitly represent the correspondi…
View article: Flat-band-induced non-Fermi-liquid behavior of multicomponent fermions
Flat-band-induced non-Fermi-liquid behavior of multicomponent fermions Open
We investigate multicomponent fermions in a flat band and predict\nexperimental signatures of non-Fermi liquid behavior. We use dynamical\nmean-field theory to obtain the density, double occupancy and entropy in a Lieb\nlattice for $\\math…
View article: Observation of antiferromagnetic correlations in an ultracold SU($N$) Hubbard model
Observation of antiferromagnetic correlations in an ultracold SU($N$) Hubbard model Open
Mott insulators are paradigms of strongly correlated physics, giving rise to phases of matter with novel and hard-to-explain properties. Extending the typical SU(2) symmetry of Mott insulators to SU($N$) is predicted to give exotic quantum…
View article: Energy redistribution and spatiotemporal evolution of correlations after a sudden quench of the Bose-Hubbard model
Energy redistribution and spatiotemporal evolution of correlations after a sudden quench of the Bose-Hubbard model Open
Quantum simulations reveal many-body dynamics after a quench, useful for testing numerical methods with classical computers.
View article: SU(3) truncated Wigner approximation for strongly interacting Bose gases
SU(3) truncated Wigner approximation for strongly interacting Bose gases Open
We develop and utilize the SU(3) truncated Wigner approximation (TWA) in order to analyze far-from-equilibrium quantum dynamics of strongly interacting Bose gases in an optical lattice. Specifically, we explicitly represent the correspondi…
View article: PT-symmetric non-Hermitian quantum many-body system using ultracold atoms in an optical lattice with controlled dissipation
PT-symmetric non-Hermitian quantum many-body system using ultracold atoms in an optical lattice with controlled dissipation Open
We report our realization of a parity–time (PT)-symmetric non-Hermitian many-body system using cold atoms with dissipation. After developing a theoretical framework on PT-symmetric many-body systems using ultracold atoms in an optical latt…
View article: Suppression and control of prethermalization in multicomponent Fermi gases following a quantum quench
Suppression and control of prethermalization in multicomponent Fermi gases following a quantum quench Open
We investigate the mechanisms of control and suppression of pre-thermalization in $N$-component alkaline earth gases. To this end, we compute the short-time dynamics of the instantaneous momentum distribution and the relative population fo…
View article: PT-symmetric non-Hermitian quantum many-body system using ultracold atoms in an optical lattice with controlled dissipation
PT-symmetric non-Hermitian quantum many-body system using ultracold atoms in an optical lattice with controlled dissipation Open
We report our realization of a parity-time (PT) symmetric non-Hermitian many-body system using cold atoms with dissipation. After developing a theoretical framework on PT-symmetric many-body systems using ultracold atoms in an optical latt…
View article: Energy redistribution and spatio-temporal evolution of correlations after a sudden quench of the Bose-Hubbard model
Energy redistribution and spatio-temporal evolution of correlations after a sudden quench of the Bose-Hubbard model Open
An optical-lattice quantum simulator is an ideal experimental platform to investigate non-equilibrium dynamics of a quantum many-body system, which is in general hard to simulate with classical computers. Here, we use our quantum simulator…
View article: Weakly bound molecules as sensors of new gravitylike forces
Weakly bound molecules as sensors of new gravitylike forces Open
Several extensions to the Standard Model of particle physics, including light dark matter candidates and unification theories predict deviations from Newton’s law of gravitation. For macroscopic distances, the inverse-square law of gravita…
View article: Experimental determination of Bose-Hubbard energies
Experimental determination of Bose-Hubbard energies Open
We present the first experimental measurement of the ensemble averages of both the kinetic and interaction energies of the three-dimensional Bose--Hubbard model at finite temperature and various optical lattice depths across weakly to stro…
View article: Dissipative Bose-Hubbard system with intrinsic two-body loss
Dissipative Bose-Hubbard system with intrinsic two-body loss Open
We report an experimental study of dynamics of the metastable $^3P_2$ state\nof bosonic ytterbium atoms in an optical lattice. The dissipative Bose-Hubbard\nsystem with on-site two-body atom loss is realized via its intrinsic strong\ninela…
View article: Semiclassical quench dynamics of Bose gases in optical lattices
Semiclassical quench dynamics of Bose gases in optical lattices Open
We analyze the time evolution of the Bose-Hubbard model after a sudden\nquantum quench to a weakly interacting regime. Specifically, motivated by a\nrecent experiment at Kyoto University, we numerically simulate redistribution\nof the kine…
View article: Antiferromagnetic spin correlation of SU($\mathcal{N}$) Fermi gas in an optical dimerized lattice
Antiferromagnetic spin correlation of SU($\mathcal{N}$) Fermi gas in an optical dimerized lattice Open
We report on the observation of nearest-neighbor antiferromagnetic spin correlations of a Fermi gas with SU($\mathcal{N}$) symmetry trapped in an optical dimerized lattice. Quantum magnetism originates from the superexchange interaction be…
View article: Beyond-Born-Oppenheimer effects in sub-kHz-precision photoassociation spectroscopy of ytterbium atoms
Beyond-Born-Oppenheimer effects in sub-kHz-precision photoassociation spectroscopy of ytterbium atoms Open
Low-lying rovibrational levels of Yb${}_{2}$ molecules are measured by photoassociation to an accuracy of about 500 Hz. The measurements, in combination with a potential model that includes some beyond-Born-Oppenheimer effects, produce a d…
View article: Observation of the Mott insulator to superfluid crossover of a driven-dissipative Bose-Hubbard system
Observation of the Mott insulator to superfluid crossover of a driven-dissipative Bose-Hubbard system Open
We engineer the on-site dissipation to reveal its impact on the quantum phase transition from Mott insulator to superfluid.
View article: Probing Non-Newtonian gravity by photoassociation spectroscopy
Probing Non-Newtonian gravity by photoassociation spectroscopy Open
State of the art photoassociative measurements of bound state energies in the ground state Yb2 molecule are used to establish limits on non-Newtonian gravity at Yukawa ranges of nanometers.