• Welcome to Benjamin and Christian!
    This spring, two new recruits joined the group! Benjamin D’Anjou joined as a research scientist. He just arrived from Germany, where he completed a post-doctoral fellowship at the Ulm University under the supervision of Professor Martin Plenio. Christian de Correc arrived from France. He is doing a gap year as part of his master at ENS Paris-Saclay and will be […]
  • Welcome to our new visiting Phd student!
    At the beginning of January 2023, we had the pleasure to welcome Ronan Gautier. Originally from France, he is currently completing his PhD at Inria in Paris, in the QUANTIC team. He will be a visiting PhD student with the group until the end of April. Before that, he did a master in physics at Cambridge University.
  • Welcome to the new members of the group!
    This fall, we welcomed five new members to the group! First, two postdoctoral fellows joined the team. The first one, Manuel Munoz-Arias, originally from Colombia, completed his M.Sc.. and Ph.D. at the University of New Mexico and the Center for Quantum Information and Control (CQuIC). The second, Alexander McDonald, a native of Ottawa, Canada, comes from the University of Chicago, where […]
  • Welcome to Lautaro Labarca Guardo among the team!
    We are thrilled to have Lautaro Labarca Guardo join the group, arriving from Santiago, Chile. During his Undergraduate studies in Energy Engineering at Universidad de León, Spain, Lautaro focused his Thesis work on biochemical fuel cells as a member of Dr. Antonio Morán’s lab. He completed his Master’s in Physics at Universidad de Santiago de Chile, during which his Thesis […]
  • Congratulations to Catherine and Agustin for their work on a Tunable two-qubit coupler
    Congrats to Catherine Leroux and Agustin Di Paolo for their work on their publication about a Tunable two-qubit coupler, which is now in PRApplied as an Editor’s suggestion! https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.16.064062
  • Props to Élie, Jonathan and Augustin for their latest publication on Machine learning!
    Machine learning (ML) is a promising approach for performing challenging quantum-information tasks such as device characterization, calibration, and control. ML models can train directly on the data produced by a quantum device while remaining agnostic to the quantum nature of the learning task. However, these generic models lack physical interpretability and usually require large datasets in order to learn accurately. […]
  • Welcome to Adrian Parra Rodriguez (Post Doc)
    We are thrilled to have Adrian Parra Rodriguez join the group, arriving from the Basque Country in Spain. He has completed his doctoral studies at UPV/EHU where he explored and developed mathematical techniques for the canonical quantization of superconducting networks. Now at the Institut quantique, Adrián will pursue work on quantum optics with quantum metamaterials to design quantum amplifiers, detectors, […]
  • Congratulations to Élie Genois on Completing His Master’s Thesis!
    After 2 busy years with the group, Élie Genois has completed his Master’s thesis that focuses on developing quantum-inspired machine learning approaches to characterize the dynamics of quantum devices. Staying on with the group to pursue his doctoral studies, Élie will now build on this work to explore novel avenues to improve our abilities to control the processing of quantum […]
  • Welome to Cristóbal Lledo Veloso (Post Doc)
    We are happy to see Cristóbal join the group for his post-doctoral work. Born and raised in Santiago, Chile, Cristóbal arrives at the Institut quantique from the United Kingdom where he completed his doctoral studies in theoretical condensed matter physics. Motivated by the rich and warm work environment in the institute and the group, Cristóbal has joined us to pursue […]
  • DOE-funded Quantum Systems Accelerator
    The Theory of Superconducting Quantum Device group of the Université de Sherbrooke joins the Quantum Systems Accelerator (QSA). Led by Lawrence Berkeley National Laboratory and created with a USD115 million over 5-year investment from the US Department of Energy, QSA is catalyzing leadership in quantum information science to co-design the algorithms, quantum devices, and engineering solutions needed to deliver quantum […]
  • Experimental Realization of a Protected Superconducting Circuit Derived from the 0-pi Qubit
    Encoding a qubit in logical quantum states with wave functions characterized by disjoint support and robust energies can offer simultaneous protection against relaxation and pure dephasing. One of the most promising candidates for a fully protected superconducting qubit is the 0–π . This article reports the first realization of this new qubit in an experimentally obtainable parameter regime, where the ground-state degeneracy […]
  • Quantum Metamaterial for Broadband Detection of Single Microwave Photons
    Detecting traveling photons is an essential primitive for many quantum-information processing tasks. We introduce a single-photon detector design operating in the microwave domain, based on a weakly nonlinear metamaterial where the nonlinearity is provided by a large number of Josephson junctions. The combination of weak nonlinearity and large spatial extent circumvents well-known obstacles limiting approaches based on a localized Kerr […]
  • Quantum-Optimal-Control-Inspired Ansatz for Variational Quantum Algorithms
    A central component of variational quantum algorithms (VQAs) is the state-preparation circuit, also known as ansatz or variational form. This circuit is most commonly designed such as to exploit symmetries of the problem Hamiltonian and, in this way, constrain the variational search to a subspace of interest. Here, we show that this approach is not always advantageous by introducing ansatzes […]
  • Superconducting Coupler With Exponentially Large On-off Ratio
    Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. However, most couplers operate in a narrow frequency band and target specific couplings, such as the spurious ZZ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio and without the need for fine-tuning. Our approach is […]
  • Moving Beyond the Transmon: Noise-Protected Superconducting Quantum Circuits
    Artificial atoms realized by superconducting circuits offer unique opportunities to store and process quantum information with high fidelity. Among them, implementations of circuits that harness intrinsic noise protection have been rapidly developed in recent years. These noise-protected devices constitute a new class of qubits in which the computational states are largely decoupled from local noise channels. The main challenges in engineering […]
  • Circuit Quantum Electrodynamics
    Quantum-mechanical effects at the macroscopic level were first explored in Josephson-junction-based superconducting circuits in the 1980s. In recent decades, the emergence of quantum information science has intensified research toward using these circuits as qubits in quantum information processors. […]
  • Quantum Computing with Superconducting Qubits (Part 1)
  • Quantum Computing with Superconducting Qubits (Part 2)