Göran Johansson
I’m fascinated by quantum physics, both fundamental aspects as well as applied quantum technology. One example of an interesting fundamental effect is the dynamical Casimir effect, where photons are created out of the vacuum by a mirror accelerating to velocities close to the speed of light. A more applied question is how to build a quantum computer, where the quantum mechanical phenomena superposition and entanglement are used to solve problems that are beyond the capabilities of today’s supercomputers.
A working quantum computer can find detailed properties of large biological molecules, which can lead to new medicines and other novel medical treatments. A quantum computer could also enhance artificial intelligence and gives us qualitatively new possibilities to find structures in large set of data and find better solutions to optimization problems, such as traffic control to avoid congestions.
I’m head of the Applied Quantum Physics laboratory and also co-director of Chalmers' Area of Advance Nano.
I’ve also received two prizes: Edlundska Priset 2016 by the Royal Swedish Academy of Sciences.
Albert Wallin Science Prize 2015 by the Royal Society of Arts and Sciences in Gothenburg.
Showing 111 publications
Unconventional saturation effects at intermediate drive in a lossy cavity coupled to few emitters
Hybrid Quantum-Classical Heuristic to Solve Large-Scale Integer Linear Programs
Multimode character of quantum states released from a superconducting cavity
Universal Fidelity Reduction of Quantum Operations from Weak Dissipation
Non-Markovian Steady States of a Driven Two-Level System
Shortcut to Self-Consistent Light-Matter Interaction and Realistic Spectra from First Principles
Building blocks of a flip-chip integrated superconducting quantum processor
Wigner negativity in the steady-state output of a Kerr parametric oscillator
Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
Fast Multiqubit Gates through Simultaneous Two-Qubit Gates
Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
Oscillating bound states for a giant atom
Listening to the quantum vacuum: A perspective on the dynamical Casimir effect
Ultrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions
Tripartite Genuine Non-Gaussian Entanglement in Three-Mode Spontaneous Parametric Down-Conversion
A comparison between quantum and classical noise radar sources
Universal Gate Set for Continuous-Variable Quantum Computation with Microwave Circuits
Semiclassical analysis of dark-state transient dynamics in waveguide circuit QED
Applying the Quantum Approximate Optimization Algorithm to the Tail-Assignment Problem
Simulating moving cavities in superconducting circuits
Cavity-free vacuum-Rabi splitting in circuit quantum acoustodynamics
Numerical study of Wigner negativity in one-dimensional steady-state resonance fluorescence
Resonant and off-resonant microwave signal manipulation in coupled superconducting resonators
Towards phonon routing: controlling propagating acoustic waves in the quantum regime
Microwave photon generation in a doubly tunable superconducting resonator
Decoherence-Free Interaction between Giant Atoms in Waveguide Quantum Electrodynamics
Generating Multimode Entangled Microwaves with a Superconducting Parametric Cavity
Steady-State Generation of Wigner-Negative States in One-Dimensional Resonance Fluorescence
Multiplying and detecting propagating microwave photons using inelastic Cooper-pair tunneling
Giant acoustic atom: A single quantum system with a deterministic time delay
Towards universal quantum computation through relativistic motion
Detecting itinerant single microwave photons
Simple, robust, and on-demand generation of single and correlated photons
Correlated Cooper pair transport and microwave photon emission in the dynamical Coulomb blockade
Experimental Test of the Entanglement of Radiation Generated by the Dynamical Casimir Effect
Quantum Acoustics with Surface Acoustic Waves
Motion and gravity effects in the precision of quantum clocks
Quantum discord in the dynamical Casimir effect
Probing the quantum vacuum with an artificial atom in front of a mirror
Antibunched Photons from Inelastic Cooper-Pair Tunneling
Designing frequency-dependent relaxation rates and Lamb shifts for a giant artificial atom
Dynamical Casimir Effect Entangles Artificial Atoms
Input-output description of microwave radiation in the dynamical Coulomb blockade
Propagating phonons coupled to an artificial atom
Nonabsorbing high-efficiency counter for itinerant microwave photons
Storage and on-demand release of microwaves using superconducting resonators with tunable coupling
Quantum Nondemolition Detection of a Propagating Microwave Photon
Optomechanical-like coupling between superconducting resonators
Twin paradox with macroscopic clocks in superconducting circuits
Scattering of coherent pulses on a two-level system-single-photon generation
Reversing Quantum Trajectories with Analog Feedback
Approaching the strong coupling limit in single plasmonic nanorods interacting with J-aggregates
Nonclassical Photon Pair Production in a Voltage-Biased Josephson Junction
Giant Cross–Kerr Effect for Propagating Microwaves Induced by an Artificial Atom
Producing correlated photons using superconducting circuits
Partial-Measurement Backaction and Nonclassical Weak Values in a Superconducting Circuit
Thermal properties of charge noise sources
Scattering of coherent states on a single artificial atom
Breakdown of the Cross-Kerr Scheme for Photon Counting
Proposal for a coherent quantum memory for propagating microwave photons
Nonclassical microwave radiation from the dynamical Casimir effect
Microwave quantum optics with an artificial atom in one-dimensional open space
Relativistic Quantum Teleportation with Superconducting Circuits
Steady state entanglement of two superconducting qubits engineered by dissipation
Generation of Nonclassical Microwave States Using an Artificial Atom in 1D Open Space
Coupling of an erbium spin ensemble to a superconducting resonator
Undoing measurement-induced dephasing in circuit QED
Local probing of propagating acoustic waves in a gigahertz echo chamber
A practical photon-number-resolving detector in the microwave regime
Demonstration of a Single-Photon Router in the Microwave Regime
Observation of the dynamical Casimir effect in a superconducting circuit
Approaching perfect microwave photodetection in circuit QED
Dressed relaxation and dephasing in a strongly driven two-level system
Excess Dissipation in a Single-Electron Box: The Sisyphus Resistance
High-fidelity feedback-assisted parity measurement in circuit QED
Dynamical Casimir effect in superconducting microwave circuits
Proposal for generating and detecting multi-qubit GHZ states in circuit QED
Dynamical Casimir Effect in a Superconducting Coplanar Waveguide
Tuning the field in a microwave resonator faster than the photon lifetime
Implementation of the three-qubit phase-flip error correction code with superconducting qubits
Fast tuning of superconducting microwave cavities
Crossover from time-correlated single-electron tunneling to that of Cooper pairs
Simultaneous readout of two charge qubits
Dispersive Charge and Flux Qubit Readout as a Quantum Measurement Process
Coherence times of dressed states of a superconducting qubit under extreme driving
Fast quantum limited readout of a superconducting qubit using a slow oscillator
Readout methods and devices for Josephson-junction-based solid-state qubits
Quasiparticle Poisoning in a Single Cooper-Pair Box
Observation of quantum capacitance in the cooper-pair transistor
Coherent current transport in wide ballistic Josephson junctions
Measuring non-Gaussian fluctuations through incoherent Cooper pair current
Cavity QED in superconducting circuits: susceptibility at elevated temperatures
Full counting statistics of multiple Andreev reflection
Coherent multiple Andreev reflections and current resonances in SNS quantum point contacts
Multiple Andreev Reflection - a Microscopic Theory of ac Josephson Effect in Mesoscopic Junctions
Small superconducting junctions or numerical experiments on multiple Andreev reflections
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Showing 7 research projects
Quantum networks with time-delays and high-impedance transmission lines
Kvantinformation med mikrovågor och ytakustiska vågor
Kvantplasmonik – en teknologi för foton-fotonväxelverkan på kvantnivå vid rumstemperatur
Quantum states of photons and relativistic physics on a chip
Engineering Superconducting Circuits for Quantum Information
Quantum Propagating Microwaves in Strongly Coupled Environments (PROMISCE)
Theory for Quantum Information and Quantum Optics in Superconducting Circuits