The Conversion Revolution: Down, Up and Sideways
نویسندگان
چکیده
Continued progress in quantum communication and optical approaches to quantum computation, requires the development of enabling technologies for photonic quantum information processing [1]. Such resources include high efficiency single photon detectors, high-fidelity single-photon sources, high brightness sources of entanglement, and multiple microsecond optical quantum memories. Here we discuss our current efforts to improve this quantum information “toolbox”. Section II describes the realization of an extremely bright, high-fidelity source of entangled photon pairs, created via the process of parametric downconversion, as well as one possible method for storing such quantum bits. Section III presents one application for entanglement: the realization of the quantum communication protocol of remote state preparation, a “sideways” conversion of the state of one photon contingent on particular measurements made on the other. Finally, Section IV describes an inverse nonlinear process which enables efficient and coherent detection of infrared photons by first up-converting them into visible frequencies.
منابع مشابه
Up and Down Frequency-Conversion Properties of Eu3+ Doped Lead Fluorophosphate Nanoglass Ceramics
Europium doped transparent lead fluorophosphate glass ceramics successfully were prepared with heat treatment of precourse glasses at temperature above glass transition (Tg). X-ray diffraction (XRD) experiment evidenced the formation of PbF2 nanocrystals in glassy matrix. The emission spectra investigation indicate that considerable amount of Eu3+ ions were trapped in crystalline phase, and the...
متن کاملSampling Rate Conversion in the Discrete Linear Canonical Transform Domain
Sampling rate conversion (SRC) is one of important issues in modern sampling theory. It can be realized by up-sampling, filtering, and down-sampling operations, which need large complexity. Although some efficient algorithms have been presented to do the sampling rate conversion, they all need to compute the N-point original signal to obtain the up-sampling or the down-sampling signal in the tim...
متن کاملUpside-down spiders build upside-down orb webs: web asymmetry, spider orientation and running speed in Cyclosa.
Almost all spiders building vertical orb webs face downwards when sitting on the hubs of their webs, and their webs exhibit an up-down size asymmetry, with the lower part of the capture area being larger than the upper. However, spiders of the genus Cyclosa, which all build vertical orb webs, exhibit inter- and intraspecific variation in orientation. In particular, Cyclosa ginnaga and C. argent...
متن کاملSideways displacement of the endograft within the aneurysm sac is associated with late adverse events after endovascular aneurysm repair.
OBJECTIVE Previous studies have shown the importance of proximal and distal endograft fixation. There is little information on the middle, unsupported section of endograft within the aneurysm sac. We quantified sideways movement of the endograft within the aneurysm sac and correlated it to late adverse events. METHODS Patients who underwent endovascular abdominal aortic aneurysm (AAA) repair ...
متن کاملOn the Power of Magic Catriel Beeri* and Raghu Ramakrishnan+
D This paper considers the efficient evaluation of recursive queries expressed using Horn clauses. We define sideways information passing formally and show how a query evaluation algorithm may be defined in terms of sideways information passing and control. We then consider a class of information-passing strategies that suffices to describe most query evaluation algorithms in the database liter...
متن کامل