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Decoherence in Josephson qubits from dielectric loss.
Dielectric loss from two-level states is shown to be a dominant decoherence source in superconducting quantum bits. Depending on the qubit design, dielectric loss from insulating materials or theExpand
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Magnetism in SQUIDs at millikelvin temperatures.
We have characterized the temperature dependence of the flux threading dc SQUIDs cooled to millikelvin temperatures. The flux increases as 1/T as temperature is lowered; moreover, the flux change isExpand
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Ultrasensitive magnetic biosensor for homogeneous immunoassay.
A technique is described for specific, sensitive, quantitative, and rapid detection of biological targets by using superparamagnetic nanoparticles and a "microscope" based on a high-transitionExpand
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Liquid-State NMR and Scalar Couplings in Microtesla Magnetic Fields
We obtained nuclear magnetic resonance (NMR) spectra of liquids in fields of a few microtesla, using prepolarization in fields of a few millitesla and detection with a dc superconducting quantumExpand
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Microtesla MRI with a superconducting quantum interference device.
MRI scanners enable fast, noninvasive, and high-resolution imaging of organs and soft tissue. The images are reconstructed from NMR signals generated by nuclear spins that precess in a staticExpand
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Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout.
We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster thanExpand
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Microwave photon counter based on Josephson junctions.
We describe a microwave photon counter based on the current-biased Josephson junction. The junction is tuned to absorb single microwave photons from the incident field, after which it tunnels into aExpand
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1/f Flux noise in Josephson phase qubits.
We present a new method to measure 1/f noise in Josephson quantum bits (qubits) that yields low-frequency spectra below 1 Hz. A comparison of the noise taken at positive and negative bias of a phaseExpand
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Superconducting low-inductance undulatory galvanometer microwave amplifier: Theory
We describe a novel scheme for low-noise phase-insensitive linear amplification at microwave frequencies based on the superconducting low-inductance undulatory galvanometer (SLUG). Direct integrationExpand
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Superconducting low-inductance undulatory galvanometer microwave amplifier
We describe a microwave amplifier based on the superconducting low-inductance undulatory galvanometer (SLUG). The SLUG is embedded in a microstrip resonator, and the signal current is injectedExpand
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