Marek Pechal
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View article: Constant-depth fan-out with real-time feedforward on a superconducting quantum processor
Constant-depth fan-out with real-time feedforward on a superconducting quantum processor Open
When using unitary gate sequences, the growth in depth of many quantum circuits with output size poses significant obstacles to practical quantum computation. The quantum fan-out operation, which reduces the circuit depth of quantum algori…
View article: Direct implementation of a perceptron in superconducting circuit quantum hardware
Direct implementation of a perceptron in superconducting circuit quantum hardware Open
The utility of classical neural networks as universal approximators suggests\nthat their quantum analogues could play an important role in quantum\ngeneralizations of machine-learning methods. Inspired by the proposal in\n[Torrontegui and …
View article: Direct implementation of a perceptron in superconducting circuit quantum hardware
Direct implementation of a perceptron in superconducting circuit quantum hardware Open
The utility of classical neural networks as universal approximators suggests that their quantum analogues could play an important role in quantum generalizations of machine-learning methods. Inspired by the proposal in [Torrontegui and Gar…
View article: Characterization and Tomography of a Hidden Qubit
Characterization and Tomography of a Hidden Qubit Open
In circuit-based quantum computing, the available gate set typically consists of single-qubit gates acting on each individual qubit and at least one entangling gate between pairs of qubits. In certain physical architectures, however, some …
View article: Benchmarking the noise sensitivity of different parametric two-qubit gates in a single superconducting quantum computing platform
Benchmarking the noise sensitivity of different parametric two-qubit gates in a single superconducting quantum computing platform Open
The possibility to utilize different types of two-qubit gates on a single\nquantum computing platform adds flexibility in the decomposition of quantum\nalgorithms. A larger hardware-native gate set may decrease the number of\nrequired gate…
View article: Refroidissement radiatif d'un ensemble de spins
Refroidissement radiatif d'un ensemble de spins Open
Spins in solids interact only weakly with their electromagnetic environment and in usual situations they reach thermal equilibrium by exchanging energy with their host lattice. However, recent experiments have demonstrated that radiative e…
View article: Propagation of microwave photons along a synthetic dimension
Propagation of microwave photons along a synthetic dimension Open
The evenly-spaced modes of an electromagnetic resonator are coupled to each other by appropriate time-modulation, leading to dynamics analogous to those of particles hopping between different sites of a lattice. This substitution of a real…
View article: Two-photon resonance fluorescence of a ladder-type atomic system
Two-photon resonance fluorescence of a ladder-type atomic system Open
Multi-photon emitters are a sought-after resource in quantum photonics.\nNonlinear interactions between a multi-level atomic system and a coherent drive\ncan lead to resonant two-photon emission, but harvesting light from this\nprocess has…
View article: Observation of the Crossover from Photon Ordering to Delocalization in Tunably Coupled Resonators
Observation of the Crossover from Photon Ordering to Delocalization in Tunably Coupled Resonators Open
Networks of nonlinear resonators offer intriguing perspectives as quantum simulators for nonequilibrium many-body phases of driven-dissipative systems. Here, we employ photon correlation measurements to study the radiation fields emitted f…
View article: Superconducting circuit quantum computing with nanomechanical resonators as storage
Superconducting circuit quantum computing with nanomechanical resonators as storage Open
We analyze the quantum information processing capability of a superconducting\ntransmon circuit used to mediate interactions between quantum information\nstored in a collection of phononic crystal cavity resonators. Having only a\nsingle p…
View article: Fast and Unconditional All-Microwave Reset of a Superconducting Qubit
Fast and Unconditional All-Microwave Reset of a Superconducting Qubit Open
Active qubit reset is a key operation in many quantum algorithms, and particularly in quantum error correction. Here, we experimentally demonstrate a reset scheme for a three-level transmon artificial atom coupled to a large bandwidth reso…
View article: Coupling a Superconducting Quantum Circuit to a Phononic Crystal Defect Cavity
Coupling a Superconducting Quantum Circuit to a Phononic Crystal Defect Cavity Open
Connecting nanoscale mechanical resonators to microwave quantum circuits\nopens new avenues for storing, processing, and transmitting quantum\ninformation. In this work, we couple a phononic crystal cavity to a tunable\nsuperconducting qua…
View article: Single-Shot Quantum Nondemolition Detection of Individual Itinerant Microwave Photons
Single-Shot Quantum Nondemolition Detection of Individual Itinerant Microwave Photons Open
Single-photon detection is an essential component in many experiments in quantum optics, but it remains challenging in the microwave domain. We realize a quantum nondemolition detector for propagating microwave photons and characterize its…
View article: Millimeter-wave interconnects for microwave-frequency quantum machines
Millimeter-wave interconnects for microwave-frequency quantum machines Open
Superconducting microwave circuits form a versatile platform for storing and\nmanipulating quantum information. A major challenge to further scalability is\nto find approaches for connecting these systems over long distances and at high\nr…
View article: Correlations and Entanglement of Microwave Photons Emitted in a Cascade Decay
Correlations and Entanglement of Microwave Photons Emitted in a Cascade Decay Open
We use a three-level artificial atom in the ladder configuration as a source of correlated, single microwave photons of different frequency. The artificial atom, a transmon-type superconducting circuit, is driven at the two-photon transiti…
View article: Superconducting Switch for Fast On-Chip Routing of Quantum Microwave Fields
Superconducting Switch for Fast On-Chip Routing of Quantum Microwave Fields Open
A switch capable of routing microwave signals at cryogenic temperatures is a desirable component for state-of-the-art experiments in many fields of applied physics, including but not limited to quantum information processing, communication…
View article: Measurement of a vacuum-induced geometric phase
Measurement of a vacuum-induced geometric phase Open
A Berry phase is induced on an artificial atom coupled to a quantum field in the vacuum state by slowly varying their coupling.