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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 73 records · Page 4
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Mid-circuit correction of correlated phase errors using an array of spectator qubits

Scaling up invariably error-prone quantum processors is a formidable challenge. Although quantum error correction ultimately promises fault-tolerant operation, the required qubit overhead and error thresholds are daunting. In a complementary proposal, colocated, auxiliary “spectator” qubits act as in situ probes of noise and enable real-time, coherent corrections of data qubit errors. We used an array of cesium spectator qubits to correct correlated phase errors on an array of rubidium data qubits. By combining in-sequence readout, data processing, and feedforward operations, these correlated errors were suppressed within the execution of the quantum circuit. The protocol is broadly applicable to quantum information platforms and establishes key tools for scaling neutral-atom quantum processors: mid-circuit readout of atom arrays, real-time processing and feedforward, and coherent mid-circuit reloading of atomic qubits.

Science & Technology - Other Topics↗
DOE OSTI2024

Quantum interference in atom-exchange reactions

Chemical reactions, in which bonds break and form, are highly dynamic quantum processes. A fundamental question is whether coherence can be preserved in chemical reactions and then harnessed to generate entangled products. Here we investigated this question by studying the 2KRb → K 2 + Rb 2 reaction at 500 nanokelvins, focusing on the nuclear spin degrees of freedom. We prepared the initial nuclear spins in KRb (potassium-rubidium) in an entangled state by lowering the magnetic field to where the spin-spin interaction dominates and characterized the preserved coherence in nuclear spin wave function after the reaction. We observed an interference pattern that is consistent with full coherence at the end of the reaction, suggesting that entanglement prepared within the reactants could be redistributed through the atom-exchange process.

Science & Technology - Other Topics↗
DOE OSTI2025

Single-Photon Generation: Materials, Techniques, and the Rydberg Exciton Frontier

Due to their quantum nature, single-photon emitters (SPE) generate individual photons in bursts or streams. They are paramount in emerging quantum technologies such as quantum key distribution, quantum repeaters, and measurement-based quantum computing. Many such systems have been reported in the last three decades, from rubidium atoms coupled to cavities to semiconductor quantum dots and color centers implanted in waveguides. This review article highlights different solid-state and atomic systems with on-demand and controlled single-photon generation. We discuss and compare the performance metrics, such as purity and indistinguishability, for these sources and evaluate their potential for different applications. Finally, a new potential single-photon source, based on the Rydberg exciton in solid-state metal oxide thin films, is introduced, where we discuss its promising features and unique advantages in fabricating quantum chips for quantum photonic applications.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
DOE OSTI2020

Materials Data on RbAuC2 by Materials Project

RbAuC2 crystallizes in the tetragonal P4/mmm space group. The structure is one-dimensional and consists of one rubidium molecule and one AuC2 ribbon oriented in the (0, 0, 1) direction. In the AuC2 ribbon, Au1- is bonded in a linear geometry to two equivalent C atoms. Both Au–C bond lengths are 2.00 Å. C is bonded in a linear geometry to one Au1- and one C atom. The C–C bond length is 1.25 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbBSe3 by Materials Project

RbBSe3 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of four rubidium molecules and two BSe3 ribbons oriented in the (1, 0, 0) direction. In each BSe3 ribbon, B3- is bonded to four Se+0.67+ atoms to form corner-sharing BSe4 tetrahedra. There are two shorter (2.06 Å) and two longer (2.09 Å) B–Se bond lengths. There are three inequivalent Se+0.67+ sites. In the first Se+0.67+ site, Se+0.67+ is bonded in a single-bond geometry to one B3- atom. In the second Se+0.67+ site, Se+0.67+ is bonded in a water-like geometry to two equivalent B3- atoms. In the third Se+0.67+ site, Se+0.67+ is bonded in a single-bond geometry to one B3- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbNa2Ge17 by Materials Project

RbNa2Ge17 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional and consists of eight rubidium molecules and one Na2Ge17 framework. In the Na2Ge17 framework, Na is bonded in a 8-coordinate geometry to twenty Ge atoms. There are a spread of Na–Ge bond distances ranging from 3.43–3.62 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded to two equivalent Na and four Ge atoms to form a mixture of edge and corner-sharing GeNa2Ge4 tetrahedra. There are one shorter (2.54 Å) and three longer (2.56 Å) Ge–Ge bond lengths. In the second Ge site, Ge is bonded in a 4-coordinate geometry to three equivalent Na and four Ge atoms. The Ge–Ge bond length is 2.53 Å. In the third Ge site, Ge is bonded in a body-centered cubic geometry to four equivalent Na and four equivalent Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb3Ir(NO2)6 by Materials Project

Rb(RbO6)2Ir(N2)3 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of twenty-four ammonia molecules, four iridium molecules, four rubidium molecules, and one RbO6 framework. In the RbO6 framework, Rb1+ is bonded in a distorted q4 geometry to twelve equivalent O2- atoms. All Rb–O bond lengths are 2.90 Å. O2- is bonded in a 3-coordinate geometry to two equivalent Rb1+ and one O2- atom. The O–O bond length is 1.29 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2PdSe16 by Materials Project

RbRbPdSe16 crystallizes in the tetragonal P-4b2 space group. The structure is three-dimensional and consists of two rubidium molecules and one RbPdSe16 framework. In the RbPdSe16 framework, Rb1+ is bonded in a distorted cuboctahedral geometry to twelve Se+0.38- atoms. There are eight shorter (3.96 Å) and four longer (4.09 Å) Rb–Se bond lengths. Pd4+ is bonded in a square co-planar geometry to four equivalent Se+0.38- atoms. All Pd–Se bond lengths are 2.47 Å. There are four inequivalent Se+0.38- sites. In the first Se+0.38- site, Se+0.38- is bonded in a 3-coordinate geometry to one Rb1+ and two Se+0.38- atoms. There are one shorter (2.40 Å) and one longer (2.42 Å) Se–Se bond lengths. In the second Se+0.38- site, Se+0.38- is bonded in a 1-coordinate geometry to one Rb1+, one Pd4+, and one Se+0.38- atom. The Se–Se bond length is 2.39 Å. In the third Se+0.38- site, Se+0.38- is bonded in a distorted water-like geometry to two Se+0.38- atoms. The Se–Se bond length is 2.41 Å. In the fourth Se+0.38- site, Se+0.38- is bonded in a 3-coordinate geometry to one Rb1+ and two Se+0.38- atoms. The Se–Se bond length is 2.40 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2SbBr6 by Materials Project

(Rb)2SbBr6 crystallizes in the tetragonal I4_1/amd space group. The structure is zero-dimensional and consists of sixteen rubidium molecules and eight SbBr6 clusters. In each SbBr6 cluster, Sb2- is bonded in an octahedral geometry to six Br atoms. There are four shorter (2.76 Å) and two longer (2.77 Å) Sb–Br bond lengths. There are two inequivalent Br sites. In the first Br site, Br is bonded in a single-bond geometry to one Sb2- atom. In the second Br site, Br is bonded in a single-bond geometry to one Sb2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbH4SNO4 by Materials Project

RbNH4SO4 is Iron carbide-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four ammonium molecules and four rubidium hydrogen sulfate molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2SbBr6 by Materials Project

(Rb)2SbBr6 is alpha bismuth trifluoride-like structured and crystallizes in the tetragonal I4_1/a space group. The structure is zero-dimensional and consists of sixteen rubidium molecules and eight SbBr6 clusters. In each SbBr6 cluster, Sb2- is bonded in an octahedral geometry to six Br atoms. There are two shorter (2.67 Å) and four longer (2.68 Å) Sb–Br bond lengths. There are two inequivalent Br sites. In the first Br site, Br is bonded in a single-bond geometry to one Sb2- atom. In the second Br site, Br is bonded in a single-bond geometry to one Sb2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2H4Pt by Materials Project

(Rb)2PtH4 is Fluorite structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is zero-dimensional and consists of two platinum tetrahydride molecules and four rubidium molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2H6Pt by Materials Project

(Rb)2PtH6 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of eight rubidium molecules and four PtH6 clusters. In each PtH6 cluster, Pt2- is bonded in an octahedral geometry to six equivalent H atoms. All Pt–H bond lengths are 1.66 Å. H is bonded in a single-bond geometry to one Pt2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb5NO5 by Materials Project

RbRb4NO5 crystallizes in the monoclinic Pm space group. The structure is two-dimensional and consists of one rubidium molecule and one Rb4NO5 sheet oriented in the (0, 1, 0) direction. In the Rb4NO5 sheet, there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. There are one shorter (2.55 Å) and one longer (2.58 Å) Rb–O bond lengths. In the second Rb1+ site, Rb1+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Rb–O bond distances ranging from 2.76–3.40 Å. N5+ is bonded in a water-like geometry to two O2- atoms. There is one shorter (1.23 Å) and one longer (1.41 Å) N–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Rb1+, one N5+, and one O2- atom. The O–O bond length is 1.39 Å. In the second O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Rb1+ and one N5+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Rb1+ and one O2- atom. In the fourth O2- site, O2- is bonded in a rectangular see-saw-like geometry to four Rb1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb19O3 by Materials Project

Rb(Rb6O)3 is Copper structured and crystallizes in the cubic Fm-3c space group. The structure is zero-dimensional and consists of eight rubidium molecules and twenty-four Rb6O clusters. In each Rb6O cluster, there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a single-bond geometry to one O atom. The Rb–O bond length is 2.63 Å. In the second Rb site, Rb is bonded in a single-bond geometry to one O atom. The Rb–O bond length is 2.95 Å. O is bonded in an octahedral geometry to six Rb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb2SbBr6 by Materials Project

(Rb)2SbBr6 is Fluorite structured and crystallizes in the monoclinic C2 space group. The structure is zero-dimensional and consists of four rubidium molecules and two SbBr6 clusters. In each SbBr6 cluster, Sb2- is bonded in an octahedral geometry to six Br atoms. All Sb–Br bond lengths are 2.72 Å. There are two inequivalent Br sites. In the first Br site, Br is bonded in a single-bond geometry to one Sb2- atom. In the second Br site, Br is bonded in a single-bond geometry to one Sb2- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RbBS3 by Materials Project

RbBS3 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of four rubidium molecules and two BS3 ribbons oriented in the (1, 0, 0) direction. In each BS3 ribbon, B3- is bonded to four S+0.67+ atoms to form corner-sharing BS4 tetrahedra. There are a spread of B–S bond distances ranging from 1.91–1.96 Å. There are three inequivalent S+0.67+ sites. In the first S+0.67+ site, S+0.67+ is bonded in a single-bond geometry to one B3- atom. In the second S+0.67+ site, S+0.67+ is bonded in a water-like geometry to two equivalent B3- atoms. In the third S+0.67+ site, S+0.67+ is bonded in a single-bond geometry to one B3- atom.

36 MATERIALS SCIENCE↗