Publications

Electro-optic frequency beam splitters and tritters for high-fidelity photonic quantum information processing

Journal: Physical Review Letters

We report experimental realization of high-fidelity photonic quantum gates for frequency-encoded qubits and qutrits based on electro-optic modulation and Fourier-transform pulse shaping. Our frequency version of the Hadamard gate offers near-unity fidelity (0.99998 + or -0.00003), requires only a single microwave...

Provably secure and high-rate quantum key distribution with time-bin qudits

Journal: Science Advances

The security of conventional cryptography systems is threatened in the forthcoming era of quantum computers. Quantum key distribution (QKD) features fundamentally proven security and offers a promising option for quantum-proof cryptography solution. Although prototype QKD systems over optical fiber have been...

Plasmon dispersion in a multilayer solid torus in terms of three-term vector recurrence relations and matrix continued fractions

Journal: Journal of Physics Communications

Toroidal confinement, which has played a crucial role in magnetized plasmas and Tokamak physics, is emerging as an effective means to obtain useful electronic and optical response in solids. In particular, excitation of surface plasmons in metal nanorings by photons or electrons finds important applications due to...

Passive state preparation in the Gaussian-modulated coherent states quantum key distribution

Journal: Physical Review A

In the Gaussian-modulated coherent-states (GMCS) quantum key distribution (QKD) protocol, Alice prepares quantum states actively: For each transmission, Alice generates a pair of Gaussian-distributed random numbers, encodes them on a weak coherent pulse using optical amplitude and phase modulators, and then...

Colossal photon bunching in quasiparticle-mediated nanodiamond cathodoluminescence

Journal: Physical Review B

Nanoscale control over the second-order photon correlation function g(2)(τ) is critical to emerging research in nonlinear nanophotonics and integrated quantum information science. Here we report on quasiparticle control of photon bunching with g(2)(0)>45 in the cathodoluminescence of nanodiamond nitrogen vacancy...

Cloud Quantum Computing of an Atomic Nucleus

Journal: Physical Review Letters

We report a quantum simulation of the deuteron binding energy on quantum processors accessed via cloud servers. We use a Hamiltonian from pionless effective field theory at leading order. We design a low-depth version of the unitary coupled-cluster ansatz, use the variational quantum eigensolver algorithm, and...

Modeling sequential context effects in diagnostic interpretation of screening mammograms

Journal: J Med Imaging

Prior research has shown that physicians' medical decisions can be influenced by sequential context, particularly in cases where successive stimuli exhibit similar characteristics when analyzing medical images. This type of systematic error is known to psychophysicists as sequential context effect as it indicates...

Energy efficient stochastic-based deep spiking neural networks for sparse datasets

Journal: IEEE Explore

With large deep neural networks (DNNs) necessary to solve complex and data-intensive problems, energy efficiency is a key bottleneck for effectively deploying DL in the real world. Deep spiking NNs have gained much research attention recently due to the interest in building biological neural networks and the...

Polarization- and wavelength-resolved near-field imaging of complex plasmonic modes in Archimedean nanospirals

Journal: OSA Publishing

Asymmetric nanophotonic structures enable a wide range of opportunities in optical nanotechnology because they support efficient optical nonlinearities mediated by multiple plasmon resonances over a broad spectral range. The Archimedean nanospiral is a canonical example of a chiral plasmonic structure because it...

Quantum interference and correlation control of frequency-bin qubits

Journal: Optica

Frequency-bin quantum information encoding offers an intriguing synergy with classical optical networks, with the ability to support many qubits in a single fiber. Yet, coherent quantum frequency operations prove extremely challenging due to the difficulties in mixing frequencies arbitrarily and with low noise. In...

Dynamically Reconfigurable Metadevice Employing Nanostructured Phase-Change Materials

Journal: Nano Letters

Mastering dynamic free-space spectral control and modulation in the near-infrared (NIR) and optical regimes remains a challenging task that is hindered by the available functional materials at high frequencies. In this work, we have realized an efficient metadevice capable of spectral control by minimizing the...

Identifying the minor set cover of dense connected bipartite graphs via random matching edge sets

Journal: Quantum Information Processing

 (hi-res image) Using quantum annealing to solve an optimization problem requires minor embedding a logic graph into a known hardware graph.  In an effort to reduce the complexity of the minor embedding problem, we introdcue the minor set cover (MSC) of a known graph, G: a subset of graph minors...

High-performance computing with quantum processing units

Journal: Journal of Emerging Technology in Computing Systems

 (hi-res image) The prospects of quantum computing have driven efforts to realize fully functional quantum processing units (QPUs). Recent success in developing proof-of-principle QPUs has prompted the question of how to integrate these emerging processors into modern high-performance computing (...

Thermodynamic Effects of Single-Qubit Operations in Silicon-Based Quantum Computing

Journal: http://lanl.arxiv.org/abs/1704.05504

Silicon-based quantum logic is a promising technology to implement universal quantum computing. It is widely believed that a millikelvin cryogenic environment will be necessary to accommodate silicon-based qubits. This prompts a question of the ultimate scalability of the technology due to finite cooling capacity...

Frequency-encoded photonic qubits for scalable quantum information processing

Journal: Optica

Among the objectives for large-scale quantum computation is the quantum interconnect: a device that uses photons to interface qubits that otherwise could not interact. However, the current approaches require photons indistinguishable in frequency—a major challenge for systems experiencing different local...

High-speed switching of biphoton delays through electro-optic pump frequency modulation

Journal: APL Photonics

The realization of high-speed tunable delay control has received significant attention in the scene of classical photonics. In quantum optics, however, such rapid delay control systems for entangled photons have remained undeveloped. Here for the first time, we demonstrate rapid (2.5 MHz) modulation of signal-idler...

Secure Communication via a Recycling of Attenuated Classical Signals

Journal: Physical Review Applied

We describe a simple method of interleaving a classical and quantum signal in a secure communication system at a single wavelength. The system transmits data encrypted via a one-time pad on a classical signal and produces a single-photon reflection of the encrypted signal. This attenuated signal can be used to...

Plasticity, elasticity, and adhesion energy of plant cell walls: nanometrology of lignin loss using atomic force microscopy

Journal: Scientific Reports

The complex organic polymer, lignin, abundant in plants, prevents the efficient extraction of sugars from the cell walls that is required for large scale biofuel production. Because lignin removal is crucial in overcoming this challenge, the question of how the nanoscale properties of the plant cell ultrastructure...

Surface characterization of Populus during Caldicellulosiruptor bescii growth by TOF-SIMS analysis

Journal: ACS Sustainable Chemistry and Engineering

Caldicellulosiruptor bescii is a thermophilic, anaerobic bacterium that is capable of utilizing unpretreated biomass in addition to breaking down cellulose and hemicellulose into simple sugars. Despite the fact that C. bescii must first bind to the surface of the biomass, there has been no...

The tilt-dependent potential of mean force of a pair of DNA oligomers from all-atom molecular dynamics simulations

Journal: Journal of Physics: Condensed Matter

Electrostatic interactions between DNA molecules have been extensively studied experimentally and theoretically, but several aspects (e.g. its role in determining the pitch of the cholesteric DNA phase) still remain unclear. Here, we performed large-scale all-atom molecular dynamics simulations in explicit water...

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