Papers
Live trends in quantum computing research, updated daily from arXiv.
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Dynamical simulations of many-body quantum chaos on a quantum computer
Laurin E. Fischer, Matea Leahy, Andrew Eddins +16 more·Nov 1, 2024
Quantum circuits with local unitaries offer a platform to explore many-body quantum dynamics in discrete time. Their locality makes them suitable for current processors, but verification at scale is difficult for non-integrable systems. Here we study...
Reshaping quantum device noise via repetition code circuits
Yue Ma, Michael Hanks, Evdokia Gneusheva +1 more·Nov 1, 2024
Noise of a quantum processor can be an important resource for simulating open quantum dynamics. However, this requires characterizing the device noise and then transforming it into a target structure. Here, we take the first step toward this goal: We...
Chasing shadows with Gottesman-Kitaev-Preskill codes
Jonathan Conrad, Jens Eisert, Steven T. Flammia·Oct 31, 2024
We consider the task of performing shadow tomography of a logical subsystem defined via the Gottesman-Kitaev-Preskill (GKP) error correcting code. Our protocol does not require the input state to be a code state but is implemented by appropriate twir...
Reinforcement learning with learned gadgets to tackle hard quantum problems on real hardware
Akash Kundu, Leopoldo Sarra·Oct 31, 2024
Quantum computing offers exciting opportunities for simulating complex quantum systems and optimizing large scale combinatorial problems, but its practical use is limited by device noise and constrained connectivity. Designing quantum circuits, which...
Assessing non-Gaussian quantum state conversion with the stellar rank
Oliver Hahn, Maxime Garnier, Giulia Ferrini +2 more·Oct 31, 2024
State conversion is a fundamental task in quantum information processing. Quantum resource theories allow for analyzing and bounding conversions that use restricted sets of operations. In the context of continuous-variable systems, state conversions ...
Comparing the performance of practical two-qubit gates for individual $^{171}$Yb ions in yttrium orthovanadate
Mahsa Karimi, Faezeh Kimiaee Asadi, Stephen C. Wein +1 more·Oct 31, 2024
In this paper, we investigate three schemes for implementing Controlled-Z (CZ) gates between individual ytterbium (Yb) rare-earth ions doped into yttrium orthovanadate (YVO$_4$ or YVO). Specifically, we investigate the CZ gates based on magnetic dipo...
Topologically protected Bell-cat states in a simple spin model
B. Lajci, D. H. J. O'Dell, J. Mumford·Oct 31, 2024
We consider the topological properties of the so-called central spin model that consists of $N$ identical spins coupled to a single distinguishable central spin which arises in physical systems such as circuit-QED and bosonic Josephson junctions coup...
Detrimental non-Markovian errors for surface code memory
John F Kam, S. Gicev, Kavan Modi +2 more·Oct 31, 2024
The realization of fault-tolerant quantum computers hinges on effective quantum error correction (QEC) protocols, whose performance significantly relies on the nature of the underlying noise. In this work, we directly study the structure of non-Marko...
On-Chip Verified Quantum Computation with an Ion-Trap Quantum Processing Unit.
Cica Gustiani, D. Leichtle, Jonathan Miller +3 more·Oct 31, 2024
We present a novel approach to cryptographically secure verification and benchmarking of quantum computing, demonstrating our approach on an ion-trap quantum computer. Unlike previous cryptographically secure verification protocols, which typically r...
Improved Bounds for Testing Low Stabilizer Complexity States
Saeed Mehraban, Mehrdad Tahmasbi·Oct 31, 2024
Stabilizer states are fundamental families of quantum states with crucial applications such as error correction, quantum computation, and simulation of quantum circuits. In this paper, we study the problem of testing how close or far a quantum state ...
Error Threshold of SYK Codes from Strong-to-Weak Parity Symmetry Breaking
Jaewon Kim, E. Altman, Jong Yeon Lee·Oct 31, 2024
Quantum error correction (QEC) codes are fundamentally linked to quantum phases of matter: the degenerate ground state manifold corresponds to the code space, while topological excitations represent error syndromes. Building on this concept, the Sach...
Quantum logic for state preparation, readout, and leakage detection with binary subspace measurements
R. T. Sutherland·Oct 31, 2024
We discuss a quantum logic spectroscopy technique that uses the geometric phase gate interaction to implement quantum nondemolition (QND) measurements, distinguishing between two subspaces within a hyperfine manifold of a trapped ion. We then discuss...
Optimality Condition for the Petz Map.
Bikun Li, Zhaoyou Wang, Guo Zheng +2 more·Oct 31, 2024
In quantum error correction, the Petz map serves as a perfect recovery map when the Knill-Laflamme conditions are satisfied. Notably, while perfect recovery is generally infeasible for most quantum channels of finite dimension, the Petz map remains a...
Learning Quantum States Prepared by Shallow Circuits in Polynomial Time
Zeph Landau, Yunchao Liu·Oct 31, 2024
We give a polynomial time algorithm that, given copies of an unknown quantum state ψ=U0n that is prepared by an unknown constant depth circuit U on a finite-dimensional lattice, learns a constant depth quantum circuit that prepares ψ. The algorithm e...
Nonstabilizerness Enhances Thrifty Shadow Estimation
Datong Chen, Huangjun Zhu·Oct 31, 2024
Shadow estimation is a powerful approach for estimating the expectation values of many observables. Thrifty shadow estimation is a simple variant that is proposed to reduce the experimental overhead by reusing random circuits repeatedly. Although thi...
ECDQC: Efficient Compilation for Distributed Quantum Computing with Linear Layout
Kecheng Liu, Yidong Zhou, Haochen Luo +6 more·Oct 31, 2024
In this paper, we propose an efficient compilation method for distributed quantum computing (DQC) using the Linear Nearest Neighbor (LNN) architecture. By exploiting the LNN topology’s symmetry, we optimize quantum circuit compilation for High Local ...
Time-evolving-matrix-product-operator method in a nondiagonal basis set based on the derivative of the path-integral expression
Shuocang Zhang, Qiang Shi·Oct 31, 2024
The time-evolving matrix product operator (TEMPO) method is a powerful tool for simulating open system quantum dynamics. Typically, it is used in problems with diagonal system-bath coupling, where analytical expressions for discretized influence func...
A Universal Quantum Computer From Relativistic Motion
Philip A. LeMaitre, T. R. Perche, Marius Krumm +1 more·Oct 31, 2024
We present an explicit construction of a relativistic quantum computing architecture using a variational quantum circuit approach that is shown to allow for universal quantum computing. The variational quantum circuit consists of tunable single-qubit...
Scaling up to problem sizes: an environmental life cycle assessment of quantum computing
S. Cordier, Karl Thibault, Marie-Luc Arpin +1 more·Oct 31, 2024
With the demonstrated ability to perform calculations in seconds that would take classical supercomputers thousands of years, quantum computers namely hold the promise of radically advancing sustainable IT. However, quantum computers face challenges ...
Classical simulation of universal measurement-based quantum computation using multipartite Bell scenarios
C. Okay, Atak Talay Yucel, Selman Ipek·Oct 31, 2024
We introduce a new classical simulation algorithm based on non-signaling polytopes of multipartite Bell scenarios, capable of simulating universal measurement-based quantum computation with single-qubit Pauli measurements. In our model, the simultane...