Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Passive Photonic CZ Gate with Two-Level Emitters in Chiral Multimode Waveguide QED
Tomás Levy-Yeyati, C. Vega, T. Ramos +1 more·Jul 8, 2024
Engineering deterministic photonic gates with simple resources is one of the long-standing challenges in photonic quantum computing. Here, we design a passive conditional gate between copropagating photons using an array of only two-level emitters. T...
Localized statistics decoding for quantum low-density parity-check codes
Timo Hillmann, Lucas Berent, A. O. Quintavalle +3 more·Jun 26, 2024
Quantum low-density parity-check codes are a promising candidate for fault-tolerant quantum computing with considerably reduced overhead compared to the surface code. However, the lack of a practical decoding algorithm remains a barrier to their impl...
Perturbative Stability and Error-Correction Thresholds of Quantum Codes
Yaodong Li, N. O’Dea, V. Khemani·Jun 22, 2024
Topologically ordered phases are stable to local perturbations, and topological quantum error-correcting codes enjoy thresholds to local errors. We connect the two notions of stability by constructing classical statistical mechanics models for decodi...
Bayesian Optimization Priors for Efficient Variational Quantum Algorithms
Farshud Sorourifar, Diana Chamaki, N. Tubman +2 more·Jun 20, 2024
Quantum computers currently rely on a hybrid quantum-classical approach known as Variational Quantum Algorithms (VQAs) to solve problems. Still, there are several challenges with VQAs on the classical computing side: it corresponds to a black-box opt...
Quantum Compiling with Reinforcement Learning on a Superconducting Processor
Z. Wang, Qiuhao Chen, Yuxuan Du +16 more·Jun 18, 2024
To effectively implement quantum algorithms on noisy intermediate-scale quantum (NISQ) processors is a central task in modern quantum technology. NISQ processors feature tens to a few hundreds of noisy qubits with limited coherence times and gate ope...
Realizing string-net condensation: Fibonacci anyon braiding for universal gates and sampling chromatic polynomials
Z. Minev, Khadijeh Najafi, Swarnadeep Majumder +5 more·Jun 18, 2024
The remarkable complexity of a topologically ordered many-body quantum system is encoded in the characteristics of its anyons. Quintessential predictions emanating from this complexity employ the Fibonacci string net condensate (Fib SNC) and its anyo...
Quantum simulation of one-dimensional fermionic systems with Ising Hamiltonians
Matthias Werner, Artur Garc'ia-S'aez, M. Estarellas·Jun 10, 2024
In recent years, analog quantum simulators have reached unprecedented quality, both in qubit numbers and coherence times. Most of these simulators natively implement Ising-type Hamiltonians, which limits the class of models that can be simulated effi...
Learning topological states from randomized measurements using variational tensor network tomography
Y. Teng, R. Samajdar, Katherine Van Kirk +5 more·May 31, 2024
Learning faithful representations of quantum states is crucial to fully characterizing the variety of many-body states created on quantum processors. While various tomographic methods such as classical shadow and MPS tomography have shown promise in ...
On Low-Rank Multiplicity-Free Fusion Categories
Gert Vercleyen·May 30, 2024
This thesis explains the methods and algorithms we used to obtain explicit F symbols, R symbols, and pivotal coefficients of all multiplicity-free pivotal fusion categories up to rank 7. The thesis starts by introducing the concept of a unitary modul...
Anomaly inflow for CSS and fractonic lattice models and dualities via cluster state measurement
Takuya Okuda, Aswin Parayil Mana, Hiroki Sukeno·May 24, 2024
Calderbank-Shor-Steane (CSS) codes are a class of quantum error correction codes that contains the toric code and fracton models. A procedure called foliation defines a cluster state for a given CSS code. We use the CSS chain complex and its tensor p...
Non-Abelian Self-Correcting Quantum Memory and Transversal Non-Clifford Gate beyond the $n^{1/3}$ Distance Barrier
Po-Shen Hsin, Ryohei Kobayashi, Guanyu Zhu·May 20, 2024
We construct a family of infinitely many new candidate non-Abelian self-correcting topological quantum memories in $D\geq 5+1$ spacetime dimensions without particle excitations using local commuting non-Pauli stabilizer lattice models and field theor...
Demonstrating a universal logical gate set in error-detecting surface codes on a superconducting quantum processor
Jiaxuan Zhang, Zhao-Yun Chen, Yun-Jie Wang +6 more·May 15, 2024
Fault-tolerant quantum computing (FTQC) is essential for achieving large-scale practical quantum computation. Implementing arbitrary FTQC requires the execution of a universal gate set on logical qubits, which is highly challenging. Particularly, in ...
Unveiling quantum phase transitions from traps in variational quantum algorithms
C. Cao, F. M. Gambetta, Ashley Montanaro +1 more·May 14, 2024
Understanding quantum phase transitions in physical systems is fundamental to characterize their behavior at low temperatures. Achieving this requires both accessing good approximations to the ground state and identifying order parameters to distingu...
How much entanglement is needed for topological codes and mixed states with anomalous symmetry?
Zhi Li, Dongjin Lee, Beni Yoshida·May 13, 2024
It is known that particles with exotic properties can emerge in systems made of simple constituents such as qubits, due to long-range quantum entanglement. In this paper, we provide quantitative characterizations of entanglement necessary for emergen...
Homological Quantum Error Correction with Torsion
Samo Nov'ak·May 6, 2024
Homological quantum error correction uses tools of algebraic topology and homological algebra to derive Calderbank-Shor-Steane quantum error correcting codes from cellulations of topological spaces. This work is an exploration of the relevant topics,...
How Much Entanglement Is Needed for Quantum Error Correction?
S. Bravyi, Dongjin Lee, Zhi Li +1 more·May 2, 2024
It is commonly believed that logical states of quantum error-correcting codes have to be highly entangled such that codes capable of correcting more errors require more entanglement to encode a qubit. Here, we show that the validity of this belief de...
Stable Symmetry-Protected Topological Phases in Systems with Heralded Noise.
Sanket Chirame, Fiona J. Burnell, Sarang Gopalakrishnan +1 more·Apr 25, 2024
We present a family of local quantum channels whose steady states exhibit stable mixed-state symmetry-protected topological (SPT) order. Motivated by recent experimental progress on "erasure conversion" techniques that allow one to identify (herald) ...
High-fidelity and Fault-tolerant Teleportation of a Logical Qubit using Transversal Gates and Lattice Surgery on a Trapped-ion Quantum Computer
C. Ryan-Anderson, N. Brown, C. Baldwin +21 more·Apr 25, 2024
Quantum state teleportation is commonly used in designs for large-scale fault-tolerant quantum computers. Using Quantinuum's H2 trapped-ion quantum processor, we implement the first demonstration of a fault-tolerant state teleportation circuit for a ...
Constant-Depth Preparation of Matrix Product States with Adaptive Quantum Circuits
Kevin C. Smith, Abid Khan, Bryan K. Clark +2 more·Apr 24, 2024
Adaptive quantum circuits, which combine local unitary gates, midcircuit measurements, and feedforward operations, have recently emerged as a promising avenue for efficient state preparation, particularly on near-term quantum devices limited to shall...
Creating Entangled Logical Qubits in the Heavy-Hex Lattice with Topological Codes
Bence Het'enyi, James R. Wootton·Apr 24, 2024
Designs for quantum error correction depend strongly on the connectivity of the qubits. For solid-state qubits, the most straightforward approach is to have connectivity constrained to a planar graph. Practical considerations may also further restric...