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22 papers · 1 filter
Generalized-ensemble simulations of spin systems and protein systems
T. Nagasima, Y. Sugita, A. Mitsutake +1
In complex systems such as spin systems and protein systems, conventional simulations in the canonical ensemble will get trapped in states of energy local minima. We employ the gen…
Quantum-optical states in finite-dimensional Hilbert space. II. State generation
Wieslaw Leonski, Adam Miranowicz
In the second part of our review (for the first part see quant-ph/0108080), we discuss a physical model for generation of "truncated" coherent and squeezed states in finite-dimensi…
Clear Evidence of a Continuum Theory of 4D Euclidean Simplicial Quantum Gravity
H. S. Egawa, S. Horata, T. Yukawa
Four-dimensional (4D) simplicial quantum gravity coupled to both scalar fields (N_X) and gauge fields (N_A) has been studied using Monte-Carlo simulations. The matter dependence of…
Maximum entanglement of quantum-dot systems with single excitation in the spin van der Waals model
A. Miranowicz, S. K. Ozdemir, M. Koashi +2
Time evolution of entanglement of N quantum dots is analyzed within the spin-1/2 van der Waals (or Lipkin-Meshkov-Glick) XY model. It is shown that, for a single dot initially exci…
Signature of the staggered flux state around a superconducting vortex in underdoped cuprates
Jun-ichiro Kishine, Patrick A. Lee, Xiao-Gang Wen
Based on the SU(2) lattice gauge theory formulation of the t-J model, we discuss possible signature of the unit cell doubling associated with the staggered flux (SF) state in the l…
A list of all integrable 2D homogeneous polynomial potentials with a polynomial integral of order at most 4 in the momenta
Katsuya Nakagawa, Haruo Yoshida
We searched integrable 2D homogeneous polynomial potential with a polynomial first integral by using the so-called direct method of searching for first integrals. We proved that th…