Quantum

Paper

Quantum copy-protection of compute-and-compare programs in the quantum random oracle model

Andrea Coladangelo, Christian Majenz, and Alexander Poremba,

Quantum 8, 1330 (2024).

Copy-protection allows a software distributor to encode a program in such a way that it can be evaluated on any input, yet it cannot be "pirated" – a notion that is impossible to achieve in…

Paper

Entanglement-assisted Quantum Reed-Muller Tensor Product Codes

Priya J. Nadkarni, Praveen Jayakumar, Arpit Behera, and Shayan Srinivasa Garani,

Quantum 8, 1329 (2024).

We present the construction of standard entanglement-assisted (EA) qubit Reed-Muller (RM) codes and their tensor product variants from classical RM codes. We show that the EA RM codes obtain…

Paper

Characterising the Hierarchy of Multi-time Quantum Processes with Classical Memory

Philip Taranto, Marco Túlio Quintino, Mio Murao, and Simon Milz,

Quantum 8, 1328 (2024).

Memory is the fundamental form of temporal complexity: when present but uncontrollable, it manifests as non-Markovian noise; conversely, if controllable, memory can be a powerful resource fo…

Paper

Low-depth simulations of fermionic systems on square-grid quantum hardware

Manuel G. Algaba, P. V. Sriluckshmy, Martin Leib, and Fedor Šimkovic IV,

Quantum 8, 1327 (2024).

We present a general strategy for mapping fermionic systems to quantum hardware with square qubit connectivity which yields low-depth quantum circuits, counted in the number of native two-qu…

Paper

Metrology and multipartite entanglement in measurement-induced phase transition

Giovanni Di Fresco, Bernardo Spagnolo, Davide Valenti, and Angelo Carollo,

Quantum 8, 1326 (2024).

Measurement-induced phase transition arises from the competition between a deterministic quantum evolution and a repeated measurement process. We explore the measurement-induced phase transi…

Paper

Complexity of Supersymmetric Systems and the Cohomology Problem

Chris Cade and P. Marcos Crichigno,

Quantum 8, 1325 (2024).

We consider the complexity of the local Hamiltonian problem in the context of fermionic Hamiltonians with $\mathcal N=2 $ supersymmetry and show that the problem remains $\mathsf{QMA}$-complete.…

Paper

Resource analysis for quantum-aided Byzantine agreement with the four-qubit singlet state

Zoltán Guba, István Finta, Ákos Budai, Lóránt Farkas, Zoltán Zimborás, and András Pályi,

Quantum 8, 1324 (2024).

In distributed computing, a Byzantine fault is a condition where a component behaves inconsistently, showing different symptoms to different components of the system. Consensus among the cor…

Paper

Hidden variable model for quantum computation with magic states on qudits of any dimension

Michael Zurel, Cihan Okay, Robert Raussendorf, and Arne Heimendahl,

Quantum 8, 1323 (2024).

It was recently shown that a hidden variable model can be constructed for universal quantum computation with magic states on qubits. Here we show that this result can be extended, and a hidd…

Paper

Derivative Pricing using Quantum Signal Processing

Nikitas Stamatopoulos and William J. Zeng,

Quantum 8, 1322 (2024).

Pricing financial derivatives on quantum computers typically includes quantum arithmetic components which contribute heavily to the quantum resources required by the corresponding circuits.…

Paper

A family of permutationally invariant quantum codes

Arda Aydin, Max A. Alekseyev, and Alexander Barg,

Quantum 8, 1321 (2024).

We construct a new family of permutationally invariant codes that correct $t$ Pauli errors for any $t\ge 1$. We also show that codes in the new family correct quantum deletion errors as well as…

Paper

Approximating quantum channels by completely positive maps with small Kraus rank

Cécilia Lancien and Andreas Winter,

Quantum 8, 1320 (2024).

We study the problem of approximating a quantum channel by one with as few Kraus operators as possible (in the sense that, for any input state, the output states of the two channels should b…

Paper

Learning quantum many-body systems from a few copies

Cambyse Rouzé and Daniel Stilck França,

Quantum 8, 1319 (2024).

Estimating physical properties of quantum states from measurements is one of the most fundamental tasks in quantum science. In this work, we identify conditions on states under which it is p…

Paper

Mutually unbiased bases: polynomial optimization and symmetry

Sander Gribling and Sven Polak,

Quantum 8, 1318 (2024).

A set of $k$ orthonormal bases of $\mathbb C^d$ is called mutually unbiased if $|\langle e,f\rangle |^2 = 1/d$ whenever $e$ and $f$ are basis vectors in distinct bases. A natural question is for which…

Paper

Photonic entanglement with accelerated light

R. C. Souza Pimenta, G. H. dos Santos, A. B. Barreto, L. C. Celeri, and P. H. Souto Ribeiro,

Quantum 8, 1317 (2024).

Accelerated light has been demonstrated with laser light and diffraction. Within the diffracting field it is possible to identify a portion that carries most of the beam energy, which propag…

Paper

Double-bracket quantum algorithms for diagonalization

Marek Gluza,

Quantum 8, 1316 (2024).

This work proposes double-bracket iterations as a framework for obtaining diagonalizing quantum circuits. Their implementation on a quantum computer consists of interlacing evolutions genera…

Paper

Classical analogue of quantum superdense coding and communication advantage of a single quantum system

Ram Krishna Patra, Sahil Gopalkrishna Naik, Edwin Peter Lobo, Samrat Sen, Tamal Guha, Some Sankar Bhattacharya, Mir Alimuddin, and Manik Banik,

Quantum 8, 1315 (2024).

We analyze utility of communication channels in absence of any short of quantum or classical correlation shared between the sender and the receiver. To this aim, we propose a class of two-pa…

Category: Paper