UMBC Joint Center for Earth Systems Technology (JCET)
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The Joint Center for Earth Systems Technology (JCET) was formed under a Cooperative agreement between the Earth Science Division of NASA Goddard Space Flight Center (GSFC) and the University of Maryland, Baltimore County (UMBC) in 1995. The JCET family consists of its business staff, students, research faculty, GSFC Sponsors, appointed fellows and affiliated tenured/tenure-track faculty. JCET is an innovative center where these scientists interact in a seamless fashion with the support of an efficient business and administrative unit.
Recent Submissions
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Role of pump coherence in two-photon interferometry
(American Physical Society (APS), 2011-03-10)We use a parametric down-conversion source pumped by a short-coherence-length continuous-wave (CW) diode laser to perform two-photon interferometry in an intermediate regime between the more familiar Franson-type experiments ... -
Feasibility of single-photon cross-phase modulation using metastable xenon in a high finesse cavity
(Elsevier, 2014-06-19)Cross-phase modulation at the single-photon level has a wide variety of fundamental applications in quantum optics including the generation of macroscopic entangled states. Here we describe a practical method for producing ... -
Noiseless attenuation using an optical parametric amplifier
(American Physical Society (APS), 2017-10-09)The process of heralded noiseless amplification, and the inverse process of heralded noiseless attenuation, have potential applications in the context of quantum communications. Although several different physical ... -
Reduced decoherence using squeezing, amplification, and antisqueezing
(American Physical Society (APS), 2018-09-14)Loss and decoherence are major problems in the transmission of nonclassical states of light over large distances. It was recently shown that the effects of decoherence can be reduced by applying a probabilistic noiseless ... -
Compensating for beamsplitter asymmetries in quantum interference experiments
(OSA Publishing, 2010)The visibility of the quantum interference “dip” seen in the Hong–Ou–Mandel experiment is optimized when a symmetric 50⁄50 beamsplitter is used in the interferometer. Here we show that the reduction in visibility caused ... -
Low-power cross-phase modulation in a metastable xenon-filled cavity for quantum-information applications
(American Physical Society (APS), 2015-11-04)Weak single-photon nonlinearities have many potential applications in quantum computing and quantum information. Here we demonstrate a relatively simple system for producing low-power cross-phase modulation using metastable ... -
Nanofiber-segment ring resonator
(OSA Publishing, 2016)We describe a fiber ring resonator comprised of a relatively long loop of standard single-mode fiber with a short nanofiber segment. The evanescent mode of the nanofiber segment allows the cavity-enhanced field to interact ... -
Investigation of a single-photon source based on quantum interference
(IOP, 2007-06-29)We report on an experimental investigation of a single-photon source based on a quantum interference effect first demonstrated by Koashi, Matsuoka and Hirano (1996 Phys. Rev. A 53 3621). For certain types of measurement-based ... -
It’s a Good Time for Time-Bin Qubits
(American Physical Society (APS), 2013-10-09)n contrast to classical bits of information that are either 0 or 1, quantum bits—or “qubits”—can be in superposition states of 0 and 1. Just like classical bits, however, qubits are physical objects that have to be implemented ... -
Saturation of atomic transitions using subwavelength diameter tapered optical fibers in rubidium vapor
(OSA Publishing, 2014)We experimentally investigate ultralow-power saturation of the rubidium D2 transitions using a tapered optical fiber (TOF) suspended in a warm Rb vapor. A direct comparison of power-dependent absorption measurements for ... -
Heralded two-photon entanglement from probabilistic quantum logic operations on multiple parametric down-conversion sources
(IEEE, 2018-10-29)An ideal controlled-NOT gate followed by projective measurements can be used to identify specific Bell states of its two input qubits. When the input qubits are each members of independent Bell states, these projective ... -
Generation of entangled photon holes using quantum interference
(American Physical Society (APS), 2006-10-04)In addition to photon pairs entangled in polarization or other variables, quantum mechanics also allows optical beams that are entangled through the absence of the photons themselves. These correlated absences, or “entangled ... -
Ultralow-power nonlinear optics using tapered optical fibers in metastable xenon
(American Physical Society (APS), 2013-11-06)We demonstrate nanowatt-level saturated absorption using a subwavelength diameter tapered optical fiber (TOF) suspended in a gas of metastable xenon atoms. This ultralow-power nonlinearity is enabled by a small optical ... -
Ladder-type electromagnetically induced transparency using nanofiber-guided light in a warm atomic vapor
(American Physical Society (APS), 2015-10-05)We demonstrate ladder-type electromagnetically induced transparency (EIT) using an optical nanofiber suspended in a warm rubidium vapor. The signal and control fields are both guided along the nanofiber, which enables ... -
Entangled Photon Holes
(American Physical Society (APS), 2006-03-06)Most experimental demonstrations of entanglement require nonclassical states and correlated measurements of single-photon detection events. It is shown here that entanglement can produce a large decrease in the rate of ... -
Single photon source using laser pulses and two-photon absorption
(American Physical Society (APS), 2006-07-18)We have previously shown that two-photon absorption and the quantum Zeno effect can be used to make deterministic quantum logic devices from an otherwise linear optical system. Here we show that this type of quantum Zeno ... -
Probabilistic quantum encoder for single-photon qubits
(American Physical Society (APS), 2004-04-14)We describe an experiment in which a physical qubit represented by the polarization state of a single photon was probabilistically encoded in the logical state of two photons. The experiment relied on linear optics, ... -
Zeno logic gates using microcavities
(OSA Publishing, 2007)The linear optics approach to quantum computing has several potential advantages, but the logic operations are probabilistic. We review the use of the quantum Zeno effect to suppress the intrinsic failure events in these ... -
All-optical-switching demonstration using two-photon absorption and the Zeno effect
(American Physical Society (APS), 2013-02-07)Low-contrast all-optical Zeno switching has been demonstrated in a Si₃N₄ microdisk resonator coupled to warm atomic vapor. The device is based on the suppression of the resonant microcavity field buildup due to nondegenerate ...
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