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Programmable wave-function engineering is Cs Rydberg states

P. H. Bucksbaum, Douglass W. Schumacher, Dan Pinkos, J. H. Hoogenraad, Jeffrey L. Krause, Kent R. Wilson

Published Jan 1, 1994• 0 citations
OpenAlex

Abstract

We use amplified programmable shaped optical pulses to engineer Rydberg wavefunctions. The method employs a computer-controlled liquid crystal pulse shaper. The wavefunctions, which are nonstationary states, are monitored by observing temporal interference via the optical Ramsey method.

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Physical Review Letters•Jun 22, 1998•182 citations
We have used amplified, programmable, shaped optical pulses to engineer Rydberg wave packets in cesium. Our apparatus employs a computer-controlled liquid-crystal pulse shaper which could control either the phase or the magnitude of the pulse's spectrum. The shaped optical field was analyzed via cross correlation and frequency-resolved optical gating. The wave-packet evolution was analyzed by monitoring temporal interference via the optical Ramsey method to obtain both auto- and cross-interferograms of the engineered wave packet.
Summary form only given.We have devised and implemented a method to program quantum phase in Rydberg wave packets. Our method involves several recently developed techniques all acting in concert. Furthermore, the method is quite general: one need not even know the details of the atomic potential or the optical pulse shape in order to construct the desired phase function! This is because the method relies on adaptive feedback of direct phase information from the system. Below we give some details. A regenerative amplifier was seeded by 100-fs pulses from a Ti:sapphire oscillator.
Extending optical nonlinearity into the extremely weak light regime is at the heart of quantum optics, since it enables the efficient generation of photonic entanglement and implementation of photonic quantum logic gate. Here, we demonstrate the capability for continuously tunable single-photon level nonlinearity, enabled by precise control of Rydberg interaction over two orders of magnitude, through the use of microwave-assisted wave-function engineering. To characterize this nonlinearity, light storage and retrieval protocol utilizing Rydberg electromagnetically induced transparency is employed, and the quantum statistics of the retrieved photons are analyzed. As a first application, we demonstrate our protocol can speed up the preparation of single photons in low-lying Rydberg states by a factor of up to ~ 40. Our work holds the potential to accelerate quantum operations and to improve the circuit depth and connectivity in Rydberg systems, representing a crucial step towards scalable quantum information processing with Rydberg atoms.