- document
-
Corveira Rodrigues, I.C. (author), Steele, G.A. (author), Bothner, D. (author)Harmonic oscillators belong to the most fundamental concepts in physics and are central to many current research fields such as circuit QED, cavity optomechanics, and photon pressure systems. Here, we engineer a microwave mode in a superconducting LC circuit that mimics the dynamics of a negative mass oscillator, and couple it via photon...journal article 2024
- document
-
van Soest, J. (author), Potts, C.A. (author), Peiter, S.R. (author), Sanz Mora, A. (author), Steele, G.A. (author)Microwave cavities are commonly used in many experiments, including optomechanics, magnetic field sensing, magnomechanics, and circuit quantum electrodynamics. Noise, such as variations in the magnetic field or mechanical vibrations, can cause fluctuations of the natural frequency of the cavity, creating challenges in operating them in...journal article 2023
- document
-
Nishiguchi, Katsuhiko (author), Yamaguchi, Hiroshi (author), Fujiwara, Akira (author), van der Zant, H.S.J. (author), Steele, G.A. (author)We demonstrate charge detection with single-electron resolution at high readout frequency using a silicon field-effect transistor (FET) integrated with double resonant circuits. A FET, whose channel of 10-nm width enables a single electron to be detected at room temperature, is connected to resonant circuits composed of coupled inductors and...journal article 2023
- document
-
Lesne, E.L. (author), Saglam, Y.G. (author), Battilomo, Raffaele (author), Mercaldo, Maria Teresa (author), van Thiel, T.C. (author), Filippozzi, U. (author), Noce, Canio (author), Steele, G.A. (author), Caviglia, A. (author)Quantum materials can display physical phenomena rooted in the geometry of electronic wavefunctions. The corresponding geometric tensor is characterized by an emergent field known as the Berry curvature (BC). Large BCs typically arise when electronic states with different spin, orbital or sublattice quantum numbers hybridize at finite crystal...journal article 2023
- document
-
Ann, B. (author), Deve, S. (author), Steele, G.A. (author)Microwave driving is a ubiquitous technique for superconducting qubits, but the dressed states description based on the conventionally used perturbation theory cannot fully capture the dynamics in the strong driving limit. Comprehensive studies beyond these approximations applicable to transmon-based circuit quantum electrodynamics (QED)...journal article 2023
- document
-
Gely, M.F. (author), Sanz Mora, A. (author), Yanai, S. (author), van der Spek, Rik (author), Bothner, D. (author), Steele, G.A. (author)Nonlinear damping, the change in damping rate with the amplitude of oscillations plays an important role in many electrical, mechanical and even biological oscillators. In novel technologies such as carbon nanotubes, graphene membranes or superconducting resonators, the origin of nonlinear damping is sometimes unclear. This presents a problem...journal article 2023
- document
-
Masuda, Shumpei (author), Koenig, J.D. (author), Steele, G.A. (author)Quantum information processing requires fast manipulations of quantum systems in order to overcome dissipative effects. We propose a method to accelerate quantum dynamics and obtain a target state in a shorter time relative to unmodified dynamics, and apply the theory to a system consisting of two linearly coupled qubits. We extend the...journal article 2022
- document
-
Corveira Rodrigues, I.C. (author), Steele, G.A. (author), Bothner, D. (author)Photon-pressure coupling between two superconducting circuits is a promising platform for investigating radiation-pressure coupling in distinct parameter regimes and for the development of radio-frequency (RF) quantum photonics and quantum-limited RF sensing. Here, we implement photon-pressure coupling between two superconducting circuits,...journal article 2022
- document
-
Ann, B. (author), Kessels, Wouter (author), Steele, G.A. (author)In this paper, we analytically and numerically study the sideband interaction dynamics of the driven quantum Rabi model (QRM). We focus in particular on the conditions when the external transverse drive fields induce first-order sideband interactions. Inducing sideband interactions between two different systems is an essential technique for...journal article 2022
- document
-
Bothner, D. (author), Corveira Rodrigues, I.C. (author), Steele, G.A. (author)Cavity optomechanics has achieved groundbreaking control and detection of mechanical oscillators, based on their coupling to linear electromagnetic modes. Recently, however, there is increasing interest in cavity nonlinearities as resource in radiation-pressure interacting systems. Here, we present a flux-mediated optomechanical device...journal article 2022
- document
-
Gely, M.F. (author), Steele, G.A. (author)A Cooper-pair box qubit is used to squeeze the energy of a heavy oscillating membrane towards a quantum energy eigenstate, bringing measurements of how mass and quantum mechanics interplay one step closer.journal article 2021
- document
-
Haque, Mohammad T. (author), Will, Marco (author), Tomi, Matti (author), Pandey, Preeti (author), Kumar, Manohar (author), Schmidt, F.E. (author), Watanabe, Kenji (author), Taniguchi, Takashi (author), Steele, G.A. (author)We have studied 1/f noise in critical current I<sub>c</sub> in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts to ≃ 5 nA. The low frequency noise in the superconducting state is measured by tracking the variation in...journal article 2021
- document
-
Corveira Rodrigues, I.C. (author), Bothner, D. (author), Steele, G.A. (author)Quantum control of electromagnetic fields was initially established in the optical domain and has been advanced to lower frequencies in the gigahertz range during the past decades extending quantum photonics to broader frequency regimes. In standard cryogenic systems, however, thermal decoherence prevents access to the quantum regime for...journal article 2021
- document
-
Gely, M.F. (author), Steele, G.A. (author)Observing quantum phenomena in macroscopic objects, and the potential discovery of a fundamental limit in the applicability of quantum mechanics, has been a central topic of modern experimental physics. Highly coherent and heavy micromechanical oscillators controlled by superconducting circuits are a promising system for this task. Here we...journal article 2021
- document
-
Fani Sani, F. (author), Corveira Rodrigues, I.C. (author), Bothner, D. (author), Steele, G.A. (author)Nonlinear Josephson circuits play a crucial role in the growing landscape of quantum information and technologies. The typical circuits studied in this field consist of qubits, whose anharmonicity is much larger than their linewidth, and also of parametric amplifiers, which are engineered with linewidths of tens of MHz or more. The regime of...journal article 2021
- document
-
Gely, M.F. (author), Steele, G.A. (author)In the published paper, the Hamiltonian featured in figure 2 was incorrect. The term EJ/(12h) should be EJ/(24h), as shown in the corrected figure in this corrigendum. Note that this error was simply typographic, and was never reflected in the QuCAT software. (Figure Presented).journal article 2021
- document
-
Kounalakis, M. (author), Blanter, Y.M. (author), Steele, G.A. (author)We propose a scheme for controlling a radio-frequency mechanical resonator at the quantum level using a superconducting qubit. The mechanical part of the circuit consists of a suspended micrometer-long beam that is embedded in the loop of a superconducting quantum interference device (SQUID) and is connected in parallel to a transmon qubit....journal article 2020
- document
-
Gely, M.F. (author), Steele, G.A. (author)Quantum circuits constructed from Josephson junctions and superconducting electronics are key to many quantum computing and quantum optics applications. Designing these circuits involves calculating the Hamiltonian describing their quantum behavior. Here we present QuCAT, or 'Quantum Circuit Analyzer Tool', an open-source framework to help in...journal article 2020
- document
-
Bothner, D. (author), Yanai, S. (author), Iniguez-Rabago, A. (author), Yuan, M. (author), Blanter, Y.M. (author), Steele, G.A. (author)Microwave optomechanical circuits have been demonstrated to be powerful tools for both exploring fundamental physics of macroscopic mechanical oscillators, as well as being promising candidates for on-chip quantum-limited microwave devices. In most experiments so far, the mechanical oscillator is either used as a passive element and its...journal article 2020
- document
-
Papadopoulos, N. (author), Gehring, P. (author), Watanabe, Kenji (author), Taniguchi, Takashi (author), van der Zant, H.S.J. (author), Steele, G.A. (author)In transition metal dichalcogenides, defects have been found to play an important role, affecting doping, spin-valley relaxation dynamics, and assisting in proximity effects of spin-orbit coupling. Here we study localized states in WS2 and how they affect tunneling through van der Waals heterostructures of h-BN/graphene/ WS2/metal. The...journal article 2020