arXiv subjects

Moshe Shapiro

Publications and source records attributed to Moshe Shapiro.

23 records · Page 2Linked to original sources

arXiv2004

Coherent Control of Resonance-Mediated Reactions: F + HD

Cross sections resulting from scattering that proceeds via an intermediate resonance are shown to be exceptionally controllable using a coherent superposition of only two intial states. Full quantum computations on F+HD(v=0;j=0,1) --> H+DF, D+HF, which exhibits a resonance in one of the reactive channels, support the formal arguments, showing that control is indeed vast. In this case the ratio of reactive integral cross sections can be altered by a factor of 62 (compared to a noncoherent factor of only 3.3), while the ratio of reactive differential cross sections can be altered by a factor of over 6000 (compared to a noncoherent factor of less than 7). These results constitute the first prediction of extensive quantum control in a collisional process.

quant-ph↗

arXiv2002

Entanglement-Assisted Coherent Control in Nonreactive Diatom-Diatom Scattering

Intriguing quantum effects that result from entangled molecular rovibrational states are shown to provide a novel means for controlling both differential and total collision cross sections in identical particle diatom-diatom scattering. Computational results on elastic and inelastic scattering of para--H$_2$ and para--H$_2$ are presented, with the collision energy ranging from 400 cm$^{-1}$ to the ultracold regime. The experimental realization and possible extension to other systems are discussed.

quant-ph↗

arXiv2002

Two-Step Enantio-selective Optical Switch

We present an optical "enantio-selective switch", that, in two steps, turns a ("racemic") mixture of left-handed and right-handed chiral molecules into the enantiomerically pure state of interest. The optical switch is composed of an "enantio-discriminator" and an "enantio-converter" acting in tandem. The method is robust, insensitive to decay processes, and does not require molecular preorientation. We demonstrate the method on the purification of a racemate of (transiently chiral) D$_2$S$_2$ molecules, performed on the nanosecond timescale.

quant-ph↗

arXiv2002

Entanglement transfer from dissociated molecules to photons

We introduce and study the concept of a reversible transfer of the quantum state of two internally-translationally entangled fragments, formed by molecular dissociation, to a photon pair. The transfer is based on intracavity stimulated Raman adiabatic passage and it requires a combination of processes whose principles are well established.

quant-ph↗

arXiv2000

Coherently Controlled Nanoscale Molecular Deposition

Quantum interference effects are shown to provide a means of controlling and enhancing the focusing a collimated neutral molecular beam onto a surface. The nature of the aperiodic pattern formed can be altered by varying laser field characteristics and the system geometry.

quant-ph↗