7 research outputs found
Characterization and benchmarking of a phase-sensitive two-qubit gate using direct digital synthesis
We implement an iSWAP gate with two transmon qubits using a flux-tunable
coupler. Precise control of the relative phase of the qubit-control pulses and
the parametric-coupler drive is achieved with a multi-channel instrument called
Presto using direct digital synthesis (DDS), a promising technique for scaling
up quantum systems. We describe the process of tuning and benchmarking the
iSWAP gate, where the relative phase of the pulses is controlled via software.
We perform the iSWAP gate in 290 ns, validate it with quantum-state tomography,
and measure 2\% error with interleaved randomized benchmarking
Squeezing and multimode entanglement of surface acoustic wave phonons
Exploiting multiple modes in a quantum acoustic device could enable
applications in quantum information in a hardware-efficient setup, including
quantum simulation in a synthetic dimension and continuous-variable quantum
computing with cluster states.We develop a multimode surface acoustic wave
(SAW) resonator with a superconducting quantum interference device (SQUID)
integrated in one of the Bragg reflectors. The interaction with the
SQUID-shunted mirror gives rise to coupling between the more than 20 accessible
resonator modes. We exploit this coupling to demonstrate two-mode squeezing of
SAW phonons, as well as four-mode multipartite entanglement. Our results open
avenues for continuous-variable quantum computing in a compact hybrid quantum
system
Multipartite entanglement in a microwave frequency comb
Significant progress has been made with multipartite entanglement of discrete qubits, but continuous variable systems may provide a more scalable path toward entanglement of large ensembles. We demonstrate multipartite entanglement in a microwave frequency comb generated by a Josephson parametric amplifier subject to a bichromatic pump. We find 64 correlated modes in the transmission line using a multifrequency digital signal processing platform. Full inseparability is verified in a subset of seven modes. Our method can be expanded to generate even more entangled modes in the near future.
Multipartite entanglement in a microwave frequency comb
Significant progress has been made with multipartite entanglement of discrete
qubits, but continuous variable systems may provide a more scalable path toward
entanglement of large ensembles. We demonstrate multipartite entanglement in a
microwave frequency comb generated by a Josephson parametric amplifier subject
to a bichromatic pump. We find 64 correlated modes in the transmission line
using a multifrequency digital signal processing platform. Full inseparability
is verified in a subset of seven modes. Our method can be expanded to generate
even more entangled modes in the near future.Comment: 15 pages and 8 figures, including supplementary materia
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Squeezing and Multimode Entanglement of Surface Acoustic Wave Phonons
Exploiting multiple modes in a quantum acoustic device could enable applications in quantum information in a hardware-efficient setup, including quantum simulation in a synthetic dimension and continuous-variable quantum computing with cluster states. We develop a multimode surface acoustic wave (SAW) resonator with a superconducting quantum interference device (SQUID) integrated in one of the Bragg reflectors. The interaction with the SQUID-shunted mirror gives rise to coupling between the more than 20 accessible resonator modes. We exploit this coupling to demonstrate two-mode squeezing of SAW phonons, as well as four-mode multipartite entanglement. Our results open avenues for continuous-variable quantum computing in a compact hybrid quantum system
Multipartite entanglement in a microwave frequency comb
Significant progress has been made with multipartite entanglement of discrete qubits, but continuous variable systems may provide a more scalable path toward entanglement of large ensembles. We demonstrate multipartite entanglement in a microwave frequency comb generated by a Josephson parametric amplifier subject to a bichromatic pump. We find 64 correlated modes in the transmission line using a multifrequency digital signal processing platform. Full inseparability is verified in a subset of seven modes. Our method can be expanded to generate even more entangled modes in the near future.