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Lecture notes on quantum computing
Anton Frisk Kockum, Ariadna Soro, Laura García-Álvarez +4
These are the lecture notes of the master's course "Quantum Computing", taught at Chalmers University of Technology every fall since 2020, with participation of students from RWTH…
Detecting quantum speedup of random walks with machine learning
Hanna Linn, Yu Zheng, Anton Frisk Kockum
We explore the use of machine-learning techniques to detect quantum speedup in random walks on graphs. Specifically, we investigate the performance of three different neural-networ…
Giant Emitters in a Structured Bath with Non-Hermitian Skin Effect
Lei Du, Lingzhen Guo, Yan Zhang +1
Giant emitters derive their name from nonlocal field-emitter interactions and feature diverse self-interference effects. Most of the existing works on giant emitters have considere…
Heralding entangled optical photons from a microwave quantum processor
Trond Hjerpekjøn Haug, Anton Frisk Kockum, Raphaël Van Laer
Exploiting the strengths of different quantum hardware components may enhance the capabilities of emerging quantum processors. Here, we propose and analyze a quantum architecture t…
Tuning atom-field interaction via phase shaping
Y. -T. Cheng, C. -H. Chien, K. -M. Hsieh +14
A coherent electromagnetic field can be described by its amplitude, frequency, and phase. All these properties can influence the interaction between the field and an atom. Here we…
Mitigation of frequency collisions in superconducting quantum processors
Amr Osman, Jorge Fernàndez-Pendàs, Christopher Warren +6
The reproducibility of qubit parameters is a challenge for scaling up superconducting quantum processors. Signal crosstalk imposes constraints on the frequency separation between n…
Quantum process tomography of continuous-variable gates using coherent states
Mikael Kervinen, Shahnawaz Ahmed, Marina Kudra +5
Encoding quantum information into superpositions of multiple Fock states of a harmonic oscillator can provide protection against errors, but it comes with the cost of requiring mor…
Microwave amplification via interfering multi-photon processes in a half-waveguide quantum electrodynamics system
Fahad Aziz, Kuan Ting Lin, Ping Yi Wen +15
We investigate the amplification of a microwave probe signal by a superconducting artificial atom, a transmon, strongly coupled to the end of a one-dimensional semi-infinite transm…
Impact of decoherence on the fidelity of quantum gates leaving the computational subspace
Tahereh Abad, Yoni Schattner, Anton Frisk Kockum +1
The fidelity of quantum operations is often limited by incoherent errors, which typically can be modeled by fundamental Markovian noise processes such as amplitude damping and deph…
Gaussian conversion protocol for heralded generation of qunaught states
Yu Zheng, Alessandro Ferraro, Anton Frisk Kockum +1
In the field of fault-tolerant quantum computing, continuous-variable systems can be utilized to protect quantum information from noise through the use of bosonic codes. These code…