Johannes Schirk
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View article: Theory of Multi-photon Processes for Applications in Quantum Control
Theory of Multi-photon Processes for Applications in Quantum Control Open
We present a general theoretical framework for evaluating multi-photon processes in periodically driven quantum systems, which have been identified as a versatile tool for engineering and controlling nontrivial interactions in various quan…
View article: Closed-loop optimization for high-fidelity controlled-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math> gates in superconducting qubits
Closed-loop optimization for high-fidelity controlled- gates in superconducting qubits Open
Achieving fast and high-fidelity qubit operations is crucial for unlocking the potential of quantum computers. In particular, reaching low gate errors in two-qubit gates has been a long-standing challenge in the field of superconducting qu…
View article: Parametric Multielement Coupling Architecture for Coherent and Dissipative Control of Superconducting Qubits
Parametric Multielement Coupling Architecture for Coherent and Dissipative Control of Superconducting Qubits Open
As systems for quantum computing keep growing in size and number of qubits, challenges in scaling the control capabilities are becoming increasingly relevant. Efficient schemes to simultaneously mediate coherent interactions between multip…
View article: Parametric Multielement Coupling Architecture for Coherent and Dissipative Control of Superconducting Qubits
Parametric Multielement Coupling Architecture for Coherent and Dissipative Control of Superconducting Qubits Open
As systems for quantum computing keep growing in size and number of qubits, challenges in scaling the control capabilities are becoming increasingly relevant. Efficient schemes to simultaneously mediate coherent interactions between multip…
View article: Sensitivity-Adapted Closed-Loop Optimization for High-Fidelity Controlled-Z Gates in Superconducting Qubits
Sensitivity-Adapted Closed-Loop Optimization for High-Fidelity Controlled-Z Gates in Superconducting Qubits Open
Achieving fast and high-fidelity qubit operations is crucial for unlocking the potential of quantum computers. In particular, reaching low gate errors in two-qubit gates has been a long-standing challenge in the field of superconducting qu…
View article: Efficient Decoupling of a Nonlinear Qubit Mode from Its Environment
Efficient Decoupling of a Nonlinear Qubit Mode from Its Environment Open
To control and measure the state of a quantum system, it must necessarily be coupled to external degrees of freedom. This inevitably leads to spontaneous emission via the Purcell effect, photon-induced dephasing from measurement backaction…
View article: Sub-Harmonic Control of a Fluxonium Qubit via a Purcell-Protected Flux Line
Sub-Harmonic Control of a Fluxonium Qubit via a Purcell-Protected Flux Line Open
Protecting qubits from environmental noise while maintaining strong coupling for fast high-fidelity control is a central challenge for quantum information processing. Here, we demonstrate a control scheme for superconducting fluxonium qubi…
View article: Parity-dependent state transfer for direct entanglement generation
Parity-dependent state transfer for direct entanglement generation Open
As quantum information technologies advance, challenges in scaling and connectivity persist, particularly the need for long-range qubit connectivity and efficient entanglement generation. Perfect State Transfer enables time-optimal state t…
View article: Efficient decoupling of a non-linear qubit mode from its environment
Efficient decoupling of a non-linear qubit mode from its environment Open
To control and measure the state of a quantum system it must necessarily be coupled to external degrees of freedom. This inevitably leads to spontaneous emission via the Purcell effect, photon-induced dephasing from measurement back-action…