Quantum Computing and Optical Memory Using Spectral-Holeburning Techniques

Abstract

Abstract : The equipment purchased under this DURIP grant has been used in our project for studying spectral hole burning materials for applications to quantum computing as well as optical memory, using spin coherence excited and controlled by two-photon Raman transitions. The key objective was to demonstrate that NV-Diamond color centers, which has a strong oscillator strength, is suitable for this process. Recently, we have observed efficient Raman transitions, which is manifested as electromagnetically induced transparency, in NV-diamond. Specifically, we have observed near perfect alignment of spin-based quantum bits, and performed single-qubit operations on collections of these qubits. The next step is to realize CNOT operations between spectrally adjacent, distinct quantum bits in this material. The robust nature of Raman excited spin transitions in NV diamond also establishes it as a viable candidate for ultra-high-density optical memory. Finally, we have also demonstrated recently that the optically excited spin coherence produces ultra-high non-linearity, resulting in slowing the velocity of light pulses down to 45 m/sec. The equipment obtained under this DURIP has been critical to these observations. in the near future, we will expand on this work as we try to realize a many bit quantum computer, as well as a high-temperature optical memory system based on spectral-hole-burning.