Taku Izubuchi
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Research Interests
Taku Izubuchi has a total of 70 co-authors. Here are the top co-authors by number of shared publications:
- Thomas Blum
Physics Department University of Connecticut 06269-3046 Storrs CT USA
8 shared publications - Eigo Shintani
RIKEN Center for Computational Science 650-0047 Kobe Hyogo Japan
5 shared publications - Yasumichi Aoki
RIKEN Center for Computational Science
5 shared publications Hiroshi Ohki
RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
4 shared publicationsTom Blum
Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
4 shared publications- Christoph Lehner
Universität Regensburg
3 shared publications
Latest Publications
- Open Access
- 13 May 2022
- Published by American Physical Society (APS) in Physical Review D
- Vol. 105 (9) , 094503
Classically emulated digital quantum simulation of the Schwinger model with a topological term via adiabatic state preparation
We designed a protocol for digital quantum computation of a gauge theory with a topological term in Minkowski spacetime, which is practically inaccessible by standard lattice Monte Carlo simulations. We focus on dimensional quantum electrodynamics with the term known as the Schwinger model and test our protocol for this on an IBM simulator. We construct the true vacuum state of a lattice Schwinger model using adiabatic state preparation which, in turn, allows us to compute an expectation value of the fermion mass operator with respect to the vacuum. Upon taking a continuum limit we find that our result in the massless case agrees with the known exact result. In the massive case, we find an agreement with mass perturbation theory in the small-mass regime and deviations in the large-mass regime. We estimate computational costs required to take a reasonable continuum limit. Our results imply that digital quantum simulation appears a promising tool to explore nonperturbative aspects of gauge theories with real time and topological terms.- 13 May 2022
- Published by American Physical Society (APS) in Physical Review D
- Vol. 105 (9) , 094503
Open AccessClassically emulated digital quantum simulation of the Schwinger model with a topological term via adiabatic state preparation
We designed a protocol for digital quantum computation of a gauge theory with a topological term in Minkowski spacetime, which is practically inaccessible by standard lattice Monte Carlo simulations. We focus on dimensional quantum electrodynamics with the term known as the Schwinger model and test our protocol for this on an IBM simulator. We construct the true vacuum state of a lattice Schwinger model using adiabatic state preparation which, in turn, allows us to compute an expectation value of the fermion mass operator with respect to the vacuum. Upon taking a continuum limit we find that our result in the massless case agrees with the known exact result. In the massive case, we find an agreement with mass perturbation theory in the small-mass regime and deviations in the large-mass regime. We estimate computational costs required to take a reasonable continuum limit. Our results imply that digital quantum simulation appears a promising tool to explore nonperturbative aspects of gauge theories with real time and topological terms. - Open Access
- 26 March 2018
- Published by EDP Sciences in EPJ Web of Conferences
- Vol. 175, 06027
Computing nucleon EDM on a lattice
I will discuss briefly recent changes in the methodology of computing the baryon EDM on a lattice. The associated correction substantially reduces presently existing lattice values for the proton and neutron theta-induced EDMs, so that even the most precise previous lattice results become consistent with zero. On one hand, this change removes previous disagreements between these lattice results and the phenomenological estimates of the nucleon EDM. On the other hand, the nucleon EDM becomes much harder to compute on a lattice. In addition, I will review the progress in computing quark chromo-EDM-induced nucleon EDM using chiral quark action.
- 26 March 2018
- Published by EDP Sciences in EPJ Web of Conferences
- Vol. 175, 06027
Open AccessComputing nucleon EDM on a lattice
I will discuss briefly recent changes in the methodology of computing the baryon EDM on a lattice. The associated correction substantially reduces presently existing lattice values for the proton and neutron theta-induced EDMs, so that even the most precise previous lattice results become consistent with zero. On one hand, this change removes previous disagreements between these lattice results and the phenomenological estimates of the nucleon EDM. On the other hand, the nucleon EDM becomes much harder to compute on a lattice. In addition, I will review the progress in computing quark chromo-EDM-induced nucleon EDM using chiral quark action.
- Open Access
- 27 February 2017
- Published by Sissa Medialab Srl
- Vol. 256, 398
Calculation of Nucleon Electric Dipole Moments Induced by Quark Chromo-Electric Dipole Moments
We present initial results of computing nucleon electric dipole moment induced by quark chromo- EDM, CP-violating quark-gluon coupling. Using chirally-symmetric domain wall and Möbius fermions with pion mass m\pi = 172 MeV, we calculate the connected part of the electric dipole form factor F_3(Q^2). In addition, we perform an exploratory study of the method to calculate EDM using uniform background electric field on a lattice introduced without breaking the periodicity in the time direction.
- 27 February 2017
- Published by Sissa Medialab Srl
- Vol. 256, 398
Open AccessCalculation of Nucleon Electric Dipole Moments Induced by Quark Chromo-Electric Dipole Moments
We present initial results of computing nucleon electric dipole moment induced by quark chromo- EDM, CP-violating quark-gluon coupling. Using chirally-symmetric domain wall and Möbius fermions with pion mass m\pi = 172 MeV, we calculate the connected part of the electric dipole form factor F_3(Q^2). In addition, we perform an exploratory study of the method to calculate EDM using uniform background electric field on a lattice introduced without breaking the periodicity in the time direction.
- Open Access
Calculation of Nucleon Electric Dipole Moments Induced by Quark Chromo-Electric Dipole Moments
We present initial results of computing nucleon electric dipole moment induced by quark chromo-EDM, CP-violating quark-gluon coupling. Using chirally-symmetric domain wall and M\"obius fermions with pion mass $m_\pi=172\text{ MeV}$, we calculate the connected part of the electric dipole form factor $F_3(Q^2)$. In addition, we perform an exploratory study of the method to calculate EDM using uniform background electric field on a lattice introduced without breaking the periodicity in the time direction.Open AccessCalculation of Nucleon Electric Dipole Moments Induced by Quark Chromo-Electric Dipole Moments
We present initial results of computing nucleon electric dipole moment induced by quark chromo-EDM, CP-violating quark-gluon coupling. Using chirally-symmetric domain wall and M\"obius fermions with pion mass $m_\pi=172\text{ MeV}$, we calculate the connected part of the electric dipole form factor $F_3(Q^2)$. In addition, we perform an exploratory study of the method to calculate EDM using uniform background electric field on a lattice introduced without breaking the periodicity in the time direction. - Open Access
- 12 January 2017
- Published by Sissa Medialab Srl
- Vol. 280, 023
Determinations of V_us from Hadronic τ Decay Data
The current status of determinations of V_us from exclusive and inclusive hadronic $\tau$ decay data is reviewed. In the case of the inclusive determinations, we describe (i) recent progress on the implementation of the conventional flavor-breaking sum rule approach and (ii) a new dispersive approach in which lattice data, rather than the OPE, is used as theory input and only the inclusive strange experimental distribution is required. The former provides a resolution of the long-standing puzzle of >3 sigma low values of V_us obtained from previous implementations of the flavor-breaking sum rule approach, while the latter is shown to make possible a significant reduction in the impact of the region of larger experimental errors above s~2 GeV^2. Advantages of, and near-term prospects for, this new approach are also discussed.- 12 January 2017
- Published by Sissa Medialab Srl
- Vol. 280, 023
Open AccessDeterminations of V_us from Hadronic τ Decay Data
The current status of determinations of V_us from exclusive and inclusive hadronic $\tau$ decay data is reviewed. In the case of the inclusive determinations, we describe (i) recent progress on the implementation of the conventional flavor-breaking sum rule approach and (ii) a new dispersive approach in which lattice data, rather than the OPE, is used as theory input and only the inclusive strange experimental distribution is required. The former provides a resolution of the long-standing puzzle of >3 sigma low values of V_us obtained from previous implementations of the flavor-breaking sum rule approach, while the latter is shown to make possible a significant reduction in the impact of the region of larger experimental errors above s~2 GeV^2. Advantages of, and near-term prospects for, this new approach are also discussed. - Open Access
- 21 May 2015
- Published by Sissa Medialab Srl
- Vol. 214, 134
Initial nucleon structure results with chiral quarks at the physical point
- 21 May 2015
- Published by Sissa Medialab Srl
- Vol. 214, 134
Open AccessInitial nucleon structure results with chiral quarks at the physical point
- Open Access
- 21 May 2015
- Published by Sissa Medialab Srl
- Vol. 214, 164
Towards the large volume limit - An application to hadronic contributions to muon g-2 and EM corrections
- 21 May 2015
- Published by Sissa Medialab Srl
- Vol. 214, 164
Open AccessTowards the large volume limit - An application to hadronic contributions to muon g-2 and EM corrections
- Open Access
- 28 April 2014
- Published by Sissa Medialab Srl
- Vol. 187, 410
Neutral B meson mixing with static heavy and domain-wall light quarks
- 28 April 2014
- Published by Sissa Medialab Srl
- Vol. 187, 410
Open AccessNeutral B meson mixing with static heavy and domain-wall light quarks
- Open AccessCalculating the $K_L-K_S$ mass difference and $ε_K$ to sub-percent accuracyThe real and imaginary parts of the $K_L-K_S$ mixing matrix receive contributions from all three charge-2/3 quarks: up, charm and top. These give both short- and long-distance contributions which are accessible through a combination of perturbative and lattice methods. We will discuss a strategy to compute both the mass difference, $\Delta M_K$ and $\epsilon_K$ to sub-percent accuracy, looking in detail at the contributions from each of the three CKM matrix element products $V_{id}^*V_{is}$ for $i=u, c$ and $t$ as described in Ref. [1]Open AccessCalculating the $K_L-K_S$ mass difference and $ε_K$ to sub-percent accuracyThe real and imaginary parts of the $K_L-K_S$ mixing matrix receive contributions from all three charge-2/3 quarks: up, charm and top. These give both short- and long-distance contributions which are accessible through a combination of perturbative and lattice methods. We will discuss a strategy to compute both the mass difference, $\Delta M_K$ and $\epsilon_K$ to sub-percent accuracy, looking in detail at the contributions from each of the three CKM matrix element products $V_{id}^*V_{is}$ for $i=u, c$ and $t$ as described in Ref. [1]
- Open Access
Neutral B meson mixing with static heavy and domain-wall light quarks
Neutral B meson mixing matrix elements and B meson decay constants are calculated. Static approximation is used for b quark and domain-wall fermion formalism is employed for light quarks. The calculations are done on 2+1 flavor dynamical ensembles, whose lattice spacings are 0.086 fm and 0.11 fm with a fixed physical spatial volume of about (2.7 fm)^3. In the static quark action, link-smearings are used to improve the signal-to-noise ratio. We employ two kinds of link-smearings and their results are combined in taking a continuum limit. For the matching between the lattice and the continuum theory, one-loop perturbative calculations are used including O(a) improvements to reduce discretization errors. We obtain SU(3) braking ratio \xi=1.222(60) in the static limit of b quark.
Open AccessNeutral B meson mixing with static heavy and domain-wall light quarks
Neutral B meson mixing matrix elements and B meson decay constants are calculated. Static approximation is used for b quark and domain-wall fermion formalism is employed for light quarks. The calculations are done on 2+1 flavor dynamical ensembles, whose lattice spacings are 0.086 fm and 0.11 fm with a fixed physical spatial volume of about (2.7 fm)^3. In the static quark action, link-smearings are used to improve the signal-to-noise ratio. We employ two kinds of link-smearings and their results are combined in taking a continuum limit. For the matching between the lattice and the continuum theory, one-loop perturbative calculations are used including O(a) improvements to reduce discretization errors. We obtain SU(3) braking ratio \xi=1.222(60) in the static limit of b quark.