Quantum computation based on geometric phase is generally believed to be more robust against certain errors or noises than the conventional dynamical strategy. However, gate error caused by decoherence effect inevitable, and thus faster operations are highly desired. Here, we propose a nonadiabatic holonomic quantum (NHQC) scheme with detuned interactions $\Delta$-type three-level system, which...

We investigate the possibility of realizing effective quantum gates between two atoms in distant cavities coupled by an optical fiber. We show that highly reliable swap and entangling gates are achievable. We exactly study the stability of these gates in the presence of imperfections in coupling strengths and interaction times and prove them to be robust. Moreover, we analyze the effect of spon...

The novel 2xVDD NOT, NAND, and NOR logic gates have been designed and implemented in a nanoscale CMOS process with only 1xVDD devices. With the proposed dynamic source bias technique, the logic gates can be designed to have 2xVDD tolerant capability. Thus, the new 2xVDD logic gates can be operated under 2xVDD voltage environment without suffering the gate-oxide reliability issue.

In recent past, reversible logic is emerged as a promising computing paradigm with applications in low-power CMOS, quantum computing, optical computing and nanotechnology. Optical logic gates become potential component to work at macroscopic (light pulses carry information), or quantum (single photon carries information) levels with high efficiency. In this paper, we propose a novel scheme of T...

Usually models for quantum computations deal with unitary gates on pure states. In this paper we generalize the usual model. We consider a model of quantum computations in which the state is an operator of density matrix and the gates are quantum operations, not necessarily unitary. A mixed state (operator of density matrix) of n two-level quantum systems is considered as an element of 4n-dimen...