Archives: Paper

Enrique Cervero Martín, Kirill Plekhanov, and Michael Lubasch,

Quantum 7, 974 (2023).

We analyze the barren plateau phenomenon in the variational optimization of quantum circuits inspired by matrix product states (qMPS), tree tensor networks (qTTN), and the multiscale entangl…

Alfred Godley and Madalin Guta,

Quantum 7, 973 (2023).

Continuous-time measurements are instrumental for a multitude of tasks in quantum engineering and quantum control, including the estimation of dynamical parameters of open quantum systems mo…

Peter Groszkowski, Alireza Seif, Jens Koch, and A. A. Clerk,

Quantum 7, 972 (2023).

Driven quantum systems subject to non-Markovian noise are typically difficult to model even if the noise is classical. We present a systematic method based on generalized cumulant expansions…

Anthony N. Ciavarella, Stephan Caspar, Marc Illa, and Martin J. Savage,

Quantum 7, 970 (2023).

An adiabatic state preparation technique, called the adiabatic spiral, is proposed for the Heisenberg model. This technique is suitable for implementation on a number of quantum simulation p…

Cameron Foreman, Sherilyn Wright, Alec Edgington, Mario Berta, and Florian J. Curchod,

Quantum 7, 969 (2023).

We present an end-to-end and practical randomness amplification and privatisation protocol based on Bell tests. This allows the building of device-independent random number generators which…

Simone Roncallo, Krzysztof Sacha, and Lorenzo Maccone,

Quantum 7, 968 (2023).

We compare the proposals that have appeared in the literature to describe a measurement of the time of arrival of a quantum particle at a detector. We show that there are multiple regimes wh…

Jeffrey C. Y. Teo and Yichen Hu,

Quantum 7, 967 (2023).

We present a family of electron-based coupled-wire models of bosonic orbifold topological phases, referred to as twist liquids, in two spatial dimensions. All local fermion degrees of freedo…

Gabriel Matos, Chris N. Self, Zlatko Papić, Konstantinos Meichanetzidis, and Henrik Dreyer,

Quantum 7, 966 (2023).

We study variational quantum algorithms from the perspective of free fermions. By deriving the explicit structure of the associated Lie algebras, we show that the Quantum Approximate Optimiz…

Robin Corgier, Marco Malitesta, Augusto Smerzi, and Luca Pezzè,

Quantum 7, 965 (2023).

Thanks to common-mode noise rejection, differential configurations are crucial for realistic applications of phase and frequency estimation with atom interferometers. Currently, differential…

Philipp Seitz, Ismael Medina, Esther Cruz, Qunsheng Huang, and Christian B. Mendl,

Quantum 7, 964 (2023).

We develop and analyze a method for simulating quantum circuits on classical computers by representing quantum states as rooted tree tensor networks. Our algorithm first determines a suitabl…

Kaoru Mizuta and Keisuke Fujii,

Quantum 7, 962 (2023).

The implementation of time-evolution operators $U(t)$, called Hamiltonian simulation, is one of the most promising usage of quantum computers. For time-independent Hamiltonians, qubitization h…

Lorenzo Buffoni and Michele Campisi,

Quantum 7, 961 (2023).

We demonstrate an information erasure protocol that resets $N$ qubits at once. The method displays exceptional performances in terms of energy cost (it operates nearly at Landauer energy cost…

Yi-Ting Tu, Iksu Jang, Po-Yao Chang, and Yu-Chin Tzeng,

Quantum 7, 960 (2023).

The fidelity susceptibility is a tool for studying quantum phase transitions in the Hermitian condensed matter systems. Recently, it has been generalized with the biorthogonal basis for the…

Mathys Rennela, Sebastiaan Brand, Alfons Laarman, and Vedran Dunjko,

Quantum 7, 959 (2023).

One of the challenges of quantum computers in the near- and mid- term is the limited number of qubits we can use for computations. Finding methods that achieve useful quantum improvements un…