Quantum

Paper

Efficient Computation of the Quantum Rate-Distortion Function

Kerry He, James Saunderson, and Hamza Fawzi,

Quantum 8, 1314 (2024).

The quantum rate-distortion function plays a fundamental role in quantum information theory, however there is currently no practical algorithm which can efficiently compute this function to…

Paper

Optimizing Variational Quantum Algorithms with qBang: Efficiently Interweaving Metric and Momentum to Navigate Flat Energy Landscapes

David Fitzek, Robert S. Jonsson, Werner Dobrautz, and Christian Schäfer,

Quantum 8, 1313 (2024).

Variational quantum algorithms (VQAs) represent a promising approach to utilizing current quantum computing infrastructures. VQAs are based on a parameterized quantum circuit optimized in a…

Paper

Quantum advantage in temporally flat measurement-based quantum computation

Michael de Oliveira, Luís S. Barbosa, and Ernesto F. Galvão,

Quantum 8, 1312 (2024).

Several classes of quantum circuits have been shown to provide a quantum computational advantage under certain assumptions. The study of ever more restricted classes of quantum circuits capa…

Paper

Efficient solution of the non-unitary time-dependent Schrodinger equation on a quantum computer with complex absorbing potential

Mariane Mangin-Brinet, Jing Zhang, Denis Lacroix, and Edgar Andres Ruiz Guzman,

Quantum 8, 1311 (2024).

We explore the possibility of adding complex absorbing potential at the boundaries when solving the one-dimensional real-time Schrödinger evolution on a grid using a quantum computer with a…

Paper

Inplace Access to the Surface Code Y Basis

Craig Gidney,

Quantum 8, 1310 (2024).

In this paper, I cut the cost of Y basis measurement and initialization in the surface code by nearly an order of magnitude. Fusing twist defects diagonally across the surface code patch rea…

Paper

Improved Quantum Query Complexity on Easier Inputs

Noel T. Anderson, Jay-U Chung, Shelby Kimmel, Da-Yeon Koh, and Xiaohan Ye,

Quantum 8, 1309 (2024).

Quantum span program algorithms for function evaluation sometimes have reduced query complexity when promised that the input has a certain structure. We design a modified span program algori…

Paper

Two-Particle Scattering on Non-Translation Invariant Line Lattices

Luna Lima e Silva and Daniel Jost Brod,

Quantum 8, 1308 (2024).

Quantum walks have been used to develop quantum algorithms since their inception, and can be seen as an alternative to the usual circuit model; combining single-particle quantum walks on spa…

Paper

The qudit Pauli group: non-commuting pairs, non-commuting sets, and structure theorems

Rahul Sarkar and Theodore J. Yoder,

Quantum 8, 1307 (2024).

Qudits with local dimension $d \gt 2$ can have unique structure and uses that qubits ($d=2$) cannot. Qudit Pauli operators provide a very useful basis of the space of qudit states and operators.…

Paper

Quantum Monte Carlo simulations for financial risk analytics: scenario generation for equity, rate, and credit risk factors

Titos Matsakos and Stuart Nield,

Quantum 8, 1306 (2024).

Monte Carlo (MC) simulations are widely used in financial risk management, from estimating value-at-risk (VaR) to pricing over-the-counter derivatives. However, they come at a significant co…

Paper

From Non-Markovian Dissipation to Spatiotemporal Control of Quantum Nanodevices

Thibaut Lacroix, Brendon W. Lovett, and Alex W. Chin,

Quantum 8, 1305 (2024).

Nanodevices exploiting quantum effects are critically important elements of future quantum technologies (QT), but their real-world performance is strongly limited by decoherence arising from…

Paper

Generation of genuine all-way entanglement in defect-nuclear spin systems through dynamical decoupling sequences

Evangelia Takou, Edwin Barnes, and Sophia E. Economou,

Quantum 8, 1304 (2024).

Multipartite entangled states are an essential resource for sensing, quantum error correction, and cryptography. Color centers in solids are one of the leading platforms for quantum networki…

Paper

Heisenberg-limited metrology with perturbing interactions

Chao Yin and Andrew Lucas,

Quantum 8, 1303 (2024).

We show that it is possible to perform Heisenberg-limited metrology on GHZ-like states, in the presence of generic spatially local, possibly strong interactions during the measurement proces…

Paper

Loss-tolerant architecture for quantum computing with quantum emitters

Matthias C. Löbl, Stefano Paesani, and Anders S. Sørensen,

Quantum 8, 1302 (2024).

We develop an architecture for measurement-based quantum computing using photonic quantum emitters. The architecture exploits spin-photon entanglement as resource states and standard Bell me…

Paper

Enriched string-net models and their excitations

David Green, Peter Huston, Kyle Kawagoe, David Penneys, Anup Poudel, and Sean Sanford,

Quantum 8, 1301 (2024).

Boundaries of Walker-Wang models have been used to construct commuting projector models which realize chiral unitary modular tensor categories (UMTCs) as boundary excitations. Given a UMTC…

Paper

Randomized measurement protocols for lattice gauge theories

Jacob Bringewatt, Jonathan Kunjummen, and Niklas Mueller,

Quantum 8, 1300 (2024).

Randomized measurement protocols, including classical shadows, entanglement tomography, and randomized benchmarking are powerful techniques to estimate observables, perform state tomography,…

Paper

Quantum state preparation via engineered ancilla resetting

Daniel Alcalde Puente, Felix Motzoi, Tommaso Calarco, Giovanna Morigi, and Matteo Rizzi,

Quantum 8, 1299 (2024).

In this theoretical investigation, we examine the effectiveness of a protocol incorporating periodic quantum resetting for preparing ground states of frustration-free parent Hamiltonians. Th…

Category: Paper