258 citations · 675 across the 20 of their papers we have counts for
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An ultracompact dilution refrigerator for fast quantum device characterization
Clment Geffroy, Dorian Nicolas, Eric Eyraud +10
Rapid thermal cycling is a central bottleneck in the development of superconducting quantum devices: conventional dilution refrigerators require cooldowns of a day or more and subs…
Suppression of measurement-induced state transitions in cosϕ-coupling transmon readout
Cyril Mori, Francesca D Esposito, Alexandru Petrescu +12
Drive-induced unwanted state transitions (DUST) are limiting both for microwave readout and parametric operations of superconducting qubits. Among them, measurement-induced state t…
High-power readout of a transmon qubit using a nonlinear coupling
Cyril Mori, Vladimir Milchakov, Francesca D'Esposito +13
The field of superconducting qubits is constantly evolving with new circuit designs. However, when it comes to qubit readout, the use of simple transverse linear coupling remains o…
Mitigating Losses of Superconducting Qubits Strongly Coupled to Defect Modes
Dante Colao Zanuz, Quentin Ficheux, Laurent Michaud +16
The dominant contribution to the energy relaxation of state-of-the-art superconducting qubits is often attributed to their coupling to an ensemble of material defects which behave…
Using bi-fluxon tunneling to protect the Fluxonium qubit
Waël Ardati, Sébastien Léger, Shelender Kumar +8
Encoding quantum information in quantum states with disjoint wave-function support and noise insensitive energies is the key behind the idea of qubit protection. While fully protec…
Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory
François Swiadek, Ross Shillito, Paul Magnard +9
The performance of a wide range of quantum computing algorithms and protocols depends critically on the fidelity and speed of the employed qubit readout. Examples include gate sequ…
Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
Stefania Lazăr, Quentin Ficheux, Johannes Herrmann +12
The ability to execute high-fidelity operations is crucial to scaling up quantum devices to large numbers of qubits. However, signal distortions originating from non-linear compone…
Energetics of a Single Qubit Gate
Jeremy Stevens, Daniel Szombati, Maria Maffei +10
Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit but also on its energy. What is then the corresponding flow of energy between the qub…
Millisecond coherence in a superconducting qubit
Aaron Somoroff, Quentin Ficheux, Raymond A. Mencia +3
Increasing the degree of control over physical qubits is a crucial component of quantum computing research. We report a superconducting qubit of fluxonium type with the Ramsey cohe…
Arbitrary controlled-phase gate on fluxonium qubits using differential ac-Stark shifts
Haonan Xiong, Quentin Ficheux, Aaron Somoroff +7
Large scale quantum computing motivates the invention of two-qubit gate schemes that not only maximize the gate fidelity but also draw minimal resources. In the case of superconduc…
Fast logic with slow qubits: microwave-activated controlled-Z gate on low-frequency fluxoniums
Quentin Ficheux, Long B. Nguyen, Aaron Somoroff +4
We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies and . The gate is activated by…
Proposal for entangling gates on fluxonium qubits via a two-photon transition
Konstantin N. Nesterov, Quentin Ficheux, Vladimir E. Manucharyan +1
We propose a family of microwave-activated entangling gates on two capacitively coupled fluxonium qubits. A microwave pulse applied to either qubit at a frequency near the half-fre…
Quantum adiabatic elimination at arbitrary order for photon number measurement
Alain Sarlette, Pierre Rouchon, Antoine Essig +2
Adiabatic elimination is a perturbative model reduction technique based on timescale separation and often used to simplify the description of composite quantum systems. We here ana…
Multiplexed photon number measurement
Antoine Essig, Quentin Ficheux, Théau Peronnin +6
When a two-level system -- a qubit -- is used as a probe of a larger system, it naturally leads to answering a single yes-no question about the system state. Here we propose a meth…
Sequential dispersive measurement of a superconducting qubit
Théau Peronnin, Danijela Marković, Quentin Ficheux +1
We present a superconducting device that realizes the sequential measurement of a transmon qubit. The device disables common limitations of dispersive readout such as Purcell effec…
Observing the escape of a driven quantum Josephson circuit into unconfined states
Raphaël Lescanne, Lucas Verney, Quentin Ficheux +4
Josephson circuits have been ideal systems to study complex non-linear dynamics which can lead to chaotic behavior and instabilities. More recently, Josephson circuits in the quant…
Demonstration of an effective ultrastrong coupling between two oscillators
Danijela Marković, Sébastien Jezouin, Quentin Ficheux +6
When the coupling rate between two quantum systems becomes as large as their characteristic frequencies, it induces dramatic effects on their dynamics and even on the nature of the…
Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing
Q. Ficheux, S. Jezouin, Z. Leghtas +1
Decoherence originates from the leakage of quantum information into external degrees of freedom. For a qubit the two main decoherence channels are relaxation and dephasing. Here, w…
Observing a quantum Maxwell demon at work
N. Cottet, S. Jezouin, L. Bretheau +7
In apparent contradiction to the laws of thermodynamics, Maxwell's demon is able to cyclically extract work from a system in contact with a thermal bath exploiting the information…