Raymer Group Research

 

The past decade has seen advances in techniques for manipulating and measuring physical objects at the quantum level, opening a new avenue for research - Quantum Information Science. This includes quantum communication, cryptography and quantum computing, and involves fundamental aspects of quantum optics. Raymer’s group pioneered the Quantum State Tomography technique for experimentally determining the quantum wave function of a light field, which plays an important role in testing and verifying quantum information techniques. His present work includes: control and measurement of the quantum states of individual photons created by photon splitting in nonlinear-optical crystals or fibers; the use of the orbital and spin states of individual photons as carriers of quantum information bits (qubits); the translation of single-photon qubits between different wavelength channels using nonlinear-optical fibers; the creation of single-photon wave packets from semiconductor quantum dots confined in optical microcavities; the storage and retrieval of single-photon wave packets in atomic vapors; the creation of quantum-state entanglement between electronic excitations in two separate vapors. During the next decade, research will explore basic questions regarding to what extent such techniques can be used to implement new information technologies and to gain a deeper understanding of the quantum nature of light and matter.