We describe a quantum algorithm that generalizes the linear system [Harrow et al., Phys. Rev. Lett. 103, 150502 (2009)] to arbitrary problem specifications. develop state preparation routine can initialize generic states, show how simple ancilla measurements be used calculate many quantities of interest, and integrate quantum-compatible preconditioner greatly expands number problems achieve exponential speedup over classical systems solvers. To demonstrate algorithm's applicability, we it...

The mean surface temperature of the Earth depends on various climate factors with much attention directed toward possible anthropogenic causes. However, one must first determine stronger effects such as El Niño/La Niña and volcanoes. A weaker effect, which exist, is solar irradiance. We have determined effect from satellites measurements (available since 1979) irradiance lower troposphere. find sensitivity to be about twice that expected a no‐feedback Stefan‐Boltzmann radiation balance...

We provide a review of recent progress in integrated nonlinear photonics with focus on emerging applications all-optical signal processing, ultra-low-power switching, and quantum information processing.

Zero-noise extrapolation is a quantum error mitigation technique that has typically been studied under the ideal approximation noise acting on device not time correlated. In this paper, we investigate feasibility and performance of zero-noise in presence time-correlated noise. We show that, contrast to white noise, harder mitigate via because it difficult scale level without also modifying its spectral distribution. This limitation particularly strong if ``local'' gate-level methods are...

Silicon Carbide is a promising host material for spin defect based quantum sensors owing to its commercial availability and established techniques electrical optical microfabricated device integration. The negatively charged silicon vacancy one of the leading defects studied in carbide near telecom photoemission, high number, nearly temperature independent ground state zero field splitting. We report realization nanoTesla shot-noise limited ensemble magnetometry on optically detected...

We provide a modular circuit-level implementation and resource estimates for several methods of block-encoding dense <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$N\times N$</tex-math></inline-formula> matrix classical data to precision notation="LaTeX">$\epsilon$</tex-math></inline-formula> ; the minimal-depth method achieves notation="LaTeX">$T$</tex-math></inline-formula> -depth...

A comparison between different types of error models is performed. The investigation highlights the need for extra caution when choosing an adequate quantum error-correction routine, which essential step fault-tolerant computation.

We present theoretical results of a low-loss all-optical switch based on electromagnetically induced transparency and the classical Zeno effect in microdisk resonator. show that control beam can modify atomic absorption evanescent field which suppresses cavity buildup alters path weak signal beam. predict more than 35 dB switching contrast with less 0.1 loss using just 2 micro-Watts control-beam power for beams single photon intensities inside cavity.

We describe an adiabatic state transfer mechanism that allows for high-fidelity of a microwave quantum from one cavity to another through optical fiber. The conversion frequency is enabled by optomechanical transducer. process utilizes combined dark the mechanical oscillator and fiber modes, making it robust against both loss. anticipate this scheme being enabling component hybrid computing architecture consisting superconducting qubits with interconnects.

A detailed resource analysis of an established quantum algorithm for convex optimization reveals that the practical run times implied by this solution are impractical problems interest in finance.

We show that space- and time-correlated single-qubit rotation errors can lead to high-weight in a quantum circuit when the angles are drawn from heavy-tailed distributions. This leads breakdown of error correction, yielding reduced or some cases no protection encoded logical qubits. While phenomena prevalent natural world, there is very little research as whether noise with these statistics exist current processing devices. Furthermore, it an open problem develop tomographic spectroscopy...

We present and validate a novel method for noise injection of arbitrary spectra in quantum circuits that can be applied to any system capable executing single qubit rotations, including cloud-based processors. As the consequences temporally-correlated on performance algorithms are not well understood, capability engineer inject such systems is paramount. To date, capabilities have been limited highly platform specific, requiring low-level access control hardware. experimentally our universal...

We extend quantum noise spectroscopy (QNS) of amplitude control to settings where dephasing or detuning errors make significant contributions qubit dynamics. Previous approaches characterize are limited by their vulnerability low-frequency and static errors, which can overwhelm the target signal introduce bias into estimates spectrum. To overcome this problem, we leverage optimal identify a family waveforms that optimally suppress while maintaining spectral concentration in filter essential...

CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 24:15-18 (2003) - doi:10.3354/cr024015 Test for harmful collinearity among predictor variables used in modeling global temperature David H. Douglass1,*, B. Clader1, John R. Christy2, Patrick J. Michaels3, A. Belsley4 1Department of Physics and Astronomy, University Rochester, New York 14627, USA 2Earth System Science Center,...

Despite the now vast body of two-dimensional materials under study, bilayer graphene remains unique in two ways: it hosts a simultaneously tunable band gap and electron density; stems from simple fabrication methods. These advantages underscore why is critical as material for optoelectronic applications. In work that follows, we calculate one- two-photon absorption coefficients degenerate interband hosting an asymmetry adjustable chemical potential—all at finite temperature. Our analysis...

We introduce two quantum algorithms to compute the Value at Risk (VaR) and Conditional (CVaR) of financial derivatives using computers: first by applying existing ideas from risk analysis derivative pricing, second based on a novel approach Quantum Signal Processing (QSP). Previous work in literature has shown that advantage is possible context individual pricing can be leveraged straightforward manner estimation VaR CVaR. The we this aim provide an additional encoding price over multiple...

We examine fully coherent two-pulse propagation in a $\ensuremath{\Lambda}$-type medium, under two-photon resonance conditions and including inhomogeneous broadening. the effects of both short pulse preparation medium preparation. contrast cases which two pulses have or not matched envelopes, media with without ground state coherence. find that an extended interpretation area theorem for single-pulse self-induced transparency is able to unify scenarios, some aspects electromagnetically...

We analyze the effects of partial coherence ground-state preparation on two-pulse propagation in a three-level $\ensuremath{\Lambda}$ medium, contrast to previous treatments that have considered cases media whose ground states are characterized by probabilities (level populations) or probability amplitudes (coherent pure states). present analytic solutions Maxwell-Bloch equations, and we extend our analysis with numerical same equations. interpret these bright dark dressed-state basis, show...

We investigate theoretically the phenomenon of so-called fast light in an unconventional regime, using pulses sufficiently short that relaxation effects a gain medium can be ignored completely. show previously recognized instabilities, including superfluorescence, tolerated achieving pulse peak advance one full width.

We present theoretical estimates for a high-speed, low-loss, all-optical transistor using micro-resonator device, whose fields interact evanescently with Rubidium vapor. use four-level electromagnetically induced absorption scheme to couple the light of transistor. show results indicating that weak control beam can switch much stronger signal beam, contrast greater than 25 dB and loss less 0.5 dB. The switching timescale is on order 100 ps.

We report new results in neoclassical quantum optics by applying the central theme of Jaynes–Cummings paper 1963. This theme, which Jaynes and Cummings emphasized several ways, is key role that must be assigned to radiative back reaction radiation dynamics. Its consequences are well known subjects related cavity electrodynamics, its influence on optical pulse evolution theory equally strong. Here we provide a solitonic extension short-pulse broad-bandwidth propagation theory. single formula...

We analyze the propagation of fast-light pulses through a finite-length resonant gain medium both analytically and numerically. find that intrinsic instabilities can be avoided in attaining substantial peak advance with an ultrashort rather than long or adiabatic probe.

We examine the entanglement properties of a system that represents two driven microwave cavities each optomechanically coupled to separate optical which are connected by single-mode fiber. The results suggest it may be possible achieve near-maximal cavities, thus allowing teleportation scheme enable interactions for hybrid quantum computing superconducting qubits with interconnects.

We present a quantum algorithm that can solve linear system exponentially faster than the best classical algorithm. show how one use it to compute electromagnetic scattering cross-section of an arbitrary target.