15 research outputs found
Demonstrating a long-coherence dual-rail erasure qubit using tunable transmons
Quantum error correction with erasure qubits promises significant advantages
over standard error correction due to favorable thresholds for erasure errors.
To realize this advantage in practice requires a qubit for which nearly all
errors are such erasure errors, and the ability to check for erasure errors
without dephasing the qubit. We experimentally demonstrate that a "dual-rail
qubit" consisting of a pair of resonantly-coupled transmons can form a highly
coherent erasure qubit, where the erasure error rate is given by the transmon
but for which residual dephasing is strongly suppressed, leading to
millisecond-scale coherence within the qubit subspace. We show that
single-qubit gates are limited primarily by erasure errors, with erasure
probability per gate while the
residual errors are times lower. We further demonstrate mid-circuit
detection of erasure errors while introducing dephasing error per
check. Finally, we show that the suppression of transmon noise allows this
dual-rail qubit to preserve high coherence over a broad tunable operating
range, offering an improved capacity to avoid frequency collisions. This work
establishes transmon-based dual-rail qubits as an attractive building block for
hardware-efficient quantum error correction.Comment: 8+12 pages, 16 figure
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Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons
Quantum error correction with erasure qubits promises significant advantages over standard error correction due to favorable thresholds for erasure errors. To realize this advantage in practice requires a qubit for which nearly all errors are such erasure errors, and the ability to check for erasure errors without dephasing the qubit. We demonstrate that a “dual-rail qubit” consisting of a pair of resonantly coupled transmons can form a highly coherent erasure qubit, where transmon errors are converted into erasure errors and residual dephasing is strongly suppressed, leading to millisecond-scale coherence within the qubit subspace. We show that single-qubit gates are limited primarily by erasure errors, with erasure probability erasure per gate while the residual errors are times lower. We further demonstrate midcircuit detection of erasure errors while introducing dephasing error per check. Finally, we show that the suppression of transmon noise allows this dual-rail qubit to preserve high coherence over a broad tunable operating range, offering an improved capacity to avoid frequency collisions. This work establishes transmon-based dual-rail qubits as an attractive building block for hardware-efficient quantum error correction
Effect of grain boundary complexions on the deformation behavior of Ni bicrystal during bending creep
Influence of Grain Boundary Complexion on Deformation Mechanism of High Temperature Bending Creep Process of Cu Bicrystal
Micropillar compression testing of powders
An experimental design for microcompression on individual powder particles is proposed as a means of testing novel materials without the challenges associated with consolidation to produce bulk specimens. This framework is demonstrated on an amorphous tungsten alloy powder, and yields reproducible measurements of the yield strength (4.5 ± 0.3 GPa) and observations of the deformation mode (in this case, serrated flow by shear localization).United States. Defense Threat Reduction Agency (Grant HDTRA1-11-1-0062)American Society for Engineering Education. National Defense Science and Engineering Graduate Fellowshi