797 research outputs found
No-compressing of quantum phase information
We raise a general question of quantum information theory whether the quantum
phase information can be compressed and retrieved. A general qubit contains
both amplitude and phase information, while an equatorial qubit contains only a
phase information. We study whether it is possible to compress the phase
information of n equatorial qubits into m general qubits with m being less than
n, and still those information can be retrieved perfectly. We prove that this
process is not allowed by quantum mechanics.Comment: 4 pages, 1 figur
Inverse Ising effect and Ising magnetoresistance
Ising (Zeeman-type) spin-orbit coupling (SOC) generated by in-plane inverse
asymmetry has attracted considerable attention, especially in Ising
superconductors and spin-valley coupling physics. However, many unconventional
observations and emerging physical phenomena remain to be elucidated. Here, we
theoretically study the spin texture of {\sigma}_z (spin angular momentum
projection along z) induced by Ising SOC in 1Td WTe2, and propose an
unconventional spin-to-charge conversion named inverse Ising effect, in which
the directions of the spin current, spin polarization and charge current are
not orthogonal. In particular, we predict the Ising magnetoresistance, whose
resistance depends on the out-of-plane magnetic momentum in WTe2/ferromagnetic
heterostructure. The Ising magnetoresistance is believed to be an interesting
counterpart to the well studied spin Hall magnetoresistance. Our predictions
provide promising way to spin-momentum locking and spin-charge conversion based
on emerging Ising SOC
An Iterative Learning Control Design Method for Nonlinear Discrete-Time Systems with Unknown Iteration-Varying Parameters and Control Direction
An iterative learning control (ILC) scheme is designed for a class of nonlinear discrete-time dynamical systems with unknown iteration-varying parameters and control direction. The iteration-varying parameters are described by a high-order internal model (HOIM) such that the unknown parameters in the current iteration are a linear combination of the counterparts in the previous certain iterations. Under the framework of ILC, the learning convergence condition is derived through rigorous analysis. It is shown that the adaptive ILC law can achieve perfect tracking of system state in presence of iteration-varying parameters and unknown control direction. The effectiveness of the proposed control scheme is verified by simulations
Unified Universal Quantum Cloning Machine and Fidelities
We present a unified universal quantum cloning machine, which combines
several different existing universal cloning machines together including the
asymmetric case. In this unified framework, the identical pure states are
projected equally into each copy initially constituted by input and one half of
the maximally entangled states. We show explicitly that the output states of
those universal cloning machines are the same. One importance of this unified
cloning machine is that the cloning procession is always the symmetric
projection which reduces dramatically the difficulties for implementation. Also
it is found that this unified cloning machine can be directly modified to the
general asymmetric case. Besides the global fidelity and the single-copy
fidelity, we also present all possible arbitrary-copy fidelities.Comment: 4 pages, 2 figure
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