410 citations · 877 across the 15 of their papers we have counts for
17 papers
Measuring Clock Precision Without an Ideal Time Reference
Pablo Á. Domínguez, Christopher Chubb, Mischa P. Woods
Characterising physical devices typically requires comparison with more precise reference standards. For clocks, however, this approach is problematic because no physically perfect…
Characterising the precision of a clock without any external time reference
Pablo Á. Domínguez, Christopher Chubb, Mischa P. Woods
Determining a clock's precision usually requires comparison with a better time reference, yet no ideal reference is physically attainable. We show how a single clock can characteri…
Tensor Network Decoding Beyond 2D
Christophe Piveteau, Christopher T. Chubb, Joseph M. Renes
Decoding algorithms based on approximate tensor network contraction have proven tremendously successful in decoding 2D local quantum codes such as surface/toric codes and color cod…
Quantum-embeddable stochastic matrices
Fereshte Shahbeigi, Christopher T. Chubb, Ryszard Kukulski +2
The classical embeddability problem asks whether a given stochastic matrix , describing transition probabilities of a -level system, can arise from the underlying homogeneous…
Quantum dichotomies and coherent thermodynamics beyond first-order asymptotics
Patryk Lipka-Bartosik, Christopher T. Chubb, Joseph M. Renes +2
We address the problem of exact and approximate transformation of quantum dichotomies in the asymptotic regime, i.e., the existence of a quantum channel mapping $ρ_1^{…
Tailoring three-dimensional topological codes for biased noise
Eric Huang, Arthur Pesah, Christopher T. Chubb +2
Tailored topological stabilizer codes in two dimensions have been shown to exhibit high storage threshold error rates and improved subthreshold performance under biased Pauli noise…
General tensor network decoding of 2D Pauli codes
Christopher T. Chubb
In this work we develop a general tensor network decoder for 2D codes. Specifically, we propose a decoder that approximates maximally likelihood decoding for 2D stabiliser and subs…
Tailoring surface codes for highly biased noise
David K. Tuckett, Andrew S. Darmawan, Christopher T. Chubb +3
The surface code, with a simple modification, exhibits ultra-high error correction thresholds when the noise is biased towards dephasing. Here, we identify features of the surface…
Avoiding irreversibility: engineering resonant conversions of quantum resources
Kamil Korzekwa, Christopher T. Chubb, Marco Tomamichel
We identify and explore the intriguing property of resource resonance arising within resource theories of entanglement, coherence and thermodynamics. While the theories considered…
Moderate deviation analysis of majorisation-based resource interconversion
Christopher T. Chubb, Marco Tomamichel, Kamil Korzekwa
We consider the problem of interconverting a finite amount of resources within all theories whose single-shot transformation rules are based on a majorisation relation, e.g. the re…
Statistical mechanical models for quantum codes with correlated noise
Christopher T. Chubb, Steven T. Flammia
We give a broad generalisation of the mapping, originally due to Dennis, Kitaev, Landahl and Preskill, from quantum error correcting codes to statistical mechanical models. We show…
Energy cost of entanglement extraction in complex quantum systems
Cedric Beny, Christopher T. Chubb, Terry Farrelly +1
What is the energy cost of extracting entanglement from complex quantum systems? In other words, given a state of a quantum system, how much energy does it cost to extract m EPR pa…
Beyond the thermodynamic limit: finite-size corrections to state interconversion rates
Christopher T. Chubb, Marco Tomamichel, Kamil Korzekwa
Thermodynamics is traditionally constrained to the study of macroscopic systems whose energy fluctuations are negligible compared to their average energy. Here, we push beyond this…
Moderate deviation analysis for classical communication over quantum channels
Christopher T. Chubb, Vincent Y. F. Tan, Marco Tomamichel
We analyse families of codes for classical data transmission over quantum channels that have both a vanishing probability of error and a code rate approaching capacity as the code…
Approximate symmetries of Hamiltonians
Christopher T. Chubb, Steven T. Flammia
We explore the relationship between approximate symmetries of a gapped Hamiltonian and the structure of its ground space. We start by showing that approximate symmetry operators---…
Hand-waving and Interpretive Dance: An Introductory Course on Tensor Networks
Jacob C. Bridgeman, Christopher T. Chubb
The curse of dimensionality associated with the Hilbert space of spin systems provides a significant obstruction to the study of condensed matter systems. Tensor networks have prov…
Computing the Degenerate Ground Space of Gapped Spin Chains in Polynomial Time
Christopher T. Chubb, Steven T. Flammia
Given a gapped Hamiltonian of a spin chain, we give a polynomial-time algorithm for finding the degenerate ground space projector. The output is an orthonormal set of matrix produc…