Multipartite entanglement in a microwave frequency comb

Jolin, Shan W.; Andersson, Gustav; Hernández, J. C. Rivera; Strandberg, Ingrid; Quijandría, Fernando; Aumentado, José; Borgani, Riccardo; Tholén, Mats O.; Haviland, David B.

doi:10.48550/arxiv.2112.12105

Cited by 2 publications

(2 citation statements)

References 20 publications

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“…The continuous-wave mode of operation has been used to investigate multipartite entanglement of microwave modes in surface-acoustic wave resonators 26 and Josephson parametric amplifiers 27 . Another potential application of this firmware is frequency-multiplexed sensor arrays 28,29 , where a large number of superconducting microwave resonators on one transmission line are pumped at different frequencies while continuously monitoring changes in their response amplitude and phase.…”

Section: B Digital Designmentioning

confidence: 99%

Measurement and control of a superconducting quantum processor with a fully-integrated radio-frequency system on a chip

Tholén,

Borgani,

Di Carlo

et al. 2022

Preprint

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We describe a digital microwave platform called Presto, designed for measurement and control of multiple quantum bits (qubits) and based on the third-generation radio-frequency system on a chip. Presto uses direct digital synthesis to create signals up to 9 GHz on 16 synchronous output ports, while synchronously analyzing response on 16 input ports. Presto has 16 DC-bias outputs, 4 inputs and 4 outputs for digital triggers or markers, and two continuous-wave outputs for synthesizing frequencies up to 15 GHz. Scaling to a large number of qubits is enabled through deterministic synchronization of multiple Presto units. A Python application programming interface configures a firmware for synthesis and analysis of pulses, coordinated by an event sequencer. The analysis integrates template matching (matched filtering) and low-latency (184 -254 ns) feedback to enable a wide range of multi-qubit experiments. We demonstrate Presto's capabilities with experiments on a sample consisting of two superconducting qubits connected via a flux-tunable coupler. We show single-shot readout and active reset of a single qubit; randomized benchmarking of single-qubit gates showing 99.972% fidelity, limited by the coherence time of the qubit; and calibration of a two-qubit iSWAP gate.

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Section: B Digital Designmentioning

confidence: 99%

Measurement and control of a superconducting quantum processor with a fully-integrated radio-frequency system on a chip

Tholén,

Borgani,

Di Carlo

et al. 2022

Preprint

Self Cite

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“…Introduction.-The control of quantum systems composed of distinguishable bosons -also referred to as quantum continuous variables -is currently the subject of an intense research effort in the context of quantum information science and technology [1][2][3]. In fact, the infinite-dimensional Hilbert space of bosonic systems can be used to embed logical qubits with a twofold potential benefit: errors can be corrected in a hardware efficient manner [4][5][6] and highly scalable platforms can be harnessed [7][8][9][10]. Therefore, bosonic systems have been recognized as major contenders in the quest for quantum advantage [11,12] and fault-tolerant quantum computation [13].…”

mentioning

confidence: 99%

Multi-squeezed state generation and universal bosonic control via a driven quantum Rabi model

McConnell¹,

Ferraro²,

Puebla³

2022

Preprint

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Universal control over a bosonic degree of freedom is key in the quest for quantum-based technologies. Such universal control requires however the ability to perform demanding non-Gaussian gates -namely, higherthan-quadratic interactions at the level of the bosonic operators. Here we consider a single ancillary two-level system, interacting with the bosonic mode of interest via a driven quantum Rabi model, and show that it is sufficient to induce the deterministic realization of a large class of Gaussian and non-Gaussian gates, which in turn provide universal bosonic control. This scheme reduces the overhead of previous ancilla-based methods where long gate-sequences are required to generate highly populated targets. In fact, our method naturally yields the high-fidelity preparation of multi-squeezed statesi.e., the high-order generalization of displaced and squeezed states -which feature large phase-space Wigner negativities. The universal control is further illustrated by generating a cubic-phase gate. Finally, we address the resilience of the method in the presence of realistic noise. Due to the ubiquity of the considered interaction, our scheme might open new avenues in the design, preparation, and control of bosonic states in different setups.

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Multipartite entanglement in a microwave frequency comb

Cited by 2 publications

References 20 publications

Measurement and control of a superconducting quantum processor with a fully-integrated radio-frequency system on a chip

Measurement and control of a superconducting quantum processor with a fully-integrated radio-frequency system on a chip

Multi-squeezed state generation and universal bosonic control via a driven quantum Rabi model

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