Driven Nonlinear Dynamics of Two Coupled Exchange-Only Qubits

Driven Nonlinear Dynamics of Two Coupled Exchange-Only Qubits

Entanglement dynamics of two qubits coupled individually to Ohmic baths.

Developed originally for the Holstein polaron, the Davydov D1 ansatz is an efficient, yet extremely accurate trial state for time-dependent variation of the spin-boson model [N. Wu, L. Duan, X. Li, and Y. Zhao, J. Chem. Phys. 138, 084111 (2013)]. In this work, the Dirac-Frenkel time-dependent variational procedure utilizing the Davydov D1 ansatz is implemented to study entanglement dynamics of ...

Entanglement of Two Coupled Charge Qubits

YU. A. PASHKIN, T. TILMA, D. V. AVERIN, O. ASTAFIEV, T. YAMAMOTO, Y. NAKAMURA, F. NORI and J. S. TSAI The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 305-0198, Japan Department of Physics and Astronomy, Stony Brook University, SUNY Stony Brook, NY 11794, USA NEC Fundamental Research Laboratories, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan Department of...

Amplitude spectroscopy of two coupled qubits

We study the effect of a time-dependent driving field with a high amplitude on a system composed of two coupled qubits (two-level systems). Using the rotating-wave approximation (RWA) makes it possible to find simple conditions for resonant excitation of the four-level system. We find that the resonance conditions include the coupling strength between the qubits. Numerical simulations confirm t...

Effective Hamiltonian for two interacting double-dot exchange-only qubits and their controlled-NOT operations

Double dot exhange only qubit represents a promising compromise between high speed and simple fabrication in solid state implementations. A couple of interacting double dot exhange only qubits, each composed by three electrons distributed in a double quantum dot, is exploited to realize Controlled-NOT (CNOT) operations. The effective Hamiltonian model of the composite system is expressed by onl...