696 citations · 1.2k across the 16 of their papers we have counts for
17 papers
Generalised All-Optical Cat Correction
Ari John Boon, Olivier Landon-Cardinal, Nicolás Quesada
We have generalised an all-optical telecorrection protocol for the higher orders of the cat code, and show that with these higher orders we can achieve target performance at substa…
Mid-circuit measurement as an algorithmic primitive
Antoine Lemelin, Christophe Pere, Olivier Landon-Cardinal +1
We explore the usefulness of mid-circuit measurements to enhance quantum algorithmics. Specifically, we assess how quantum phase estimation (QPE) and mid-circuit measurements can i…
Topological phase diagram of induced by forbidding charges and fluxes
Anna Komar, Olivier Landon-Cardinal
We analyze phase transitions induced by forbidding charges and fluxes in , the simplest non-Abelian model among quantum doubles, a class of 2D spin lattice topolo…
Quantitative tomography for continuous variable quantum systems
Olivier Landon-Cardinal, Luke C. G. Govia, Aashish A. Clerk
We present a continuous variable tomography scheme that reconstructs the Husimi Q-function (Wigner function) by Lagrange interpolation, using measurements of the Q-function (Wigner…
Anyons are not energy eigenspaces of quantum double Hamiltonians
Anna Komar, Olivier Landon-Cardinal
Kitaev's quantum double models, including the toric code, are canonical examples of quantum topological models on a 2D spin lattice. Their Hamiltonian defines the groundspace by im…
Constructing topological models by symmetrization: A PEPS study
Carlos Fernandez-Gonzalez, Roger S. K. Mong, Olivier Landon-Cardinal +2
Symmetrization of topologically ordered wavefunctions is a powerful method for constructing new topological models. Here, we study wavefunctions obtained by symmetrizing quantum do…
Self correction requires Energy Barrier for Abelian quantum doubles
Anna Komar, Olivier Landon-Cardinal, Kristan Temme
We rigorously establish an Arrhenius law for the mixing time of quantum doubles based on any Abelian group . We have made the concept of the energy barrier therein ma…
Can long-range interactions stabilize quantum memory at nonzero temperature?
Olivier Landon-Cardinal, Beni Yoshida, David Poulin +1
A two-dimensional topologically ordered quantum memory is well protected against error if the energy gap is large compared to the temperature, but this protection does not improve…
Practical variational tomography for critical 1D systems
Jong Yeon Lee, Olivier Landon-Cardinal
We improve upon a recently introduced efficient quantum state reconstruction procedure targeted to states well-approximated by the multi-scale entanglement renormalization ansatz (…
Towards efficient decoding of classical-quantum polar codes
Mark M. Wilde, Olivier Landon-Cardinal, Patrick Hayden
Known strategies for sending bits at the capacity rate over a general channel with classical input and quantum output (a cq channel) require the decoder to implement impractically…
Local topological order inhibits thermal stability in 2D
Olivier Landon-Cardinal, David Poulin
We study the robustness of quantum information stored in the degenerate ground space of a local, frustration-free Hamiltonian with commuting terms on a 2D spin lattice. On one hand…
Practical learning method for multi-scale entangled states
Olivier Landon-Cardinal, David Poulin
We describe a method for reconstructing multi-scale entangled states from a small number of efficiently-implementable measurements and fast post-processing. The method only require…
Decoherence of a quantum gyroscope
Olivier Landon-Cardinal, Richard MacKenzie
We study the behavior of a quantum gyroscope, that is, a quantum system which singles out a direction in space in order to measure certain properties of incoming particles such as…
Practical characterization of quantum devices without tomography
Marcus P. da Silva, Olivier Landon-Cardinal, David Poulin
Quantum tomography is the main method used to assess the quality of quantum information processing devices, but its complexity presents a major obstacle for the characterization of…
Efficient quantum state tomography
Marcus Cramer, Martin B. Plenio, Steven T. Flammia +6
Quantum state tomography, the ability to deduce the state of a quantum system from measured data, is the gold standard for verification and benchmarking of quantum devices. It has…
Efficient Direct Tomography for Matrix Product States
Olivier Landon-Cardinal, Yi-Kai Liu, David Poulin
In this note, we describe a method for reconstructing matrix product states from a small number of efficiently-implementable measurements. Our method is exponentially faster than s…
Decoherence suppression via environment preparation
Olivier Landon-Cardinal, Richard MacKenzie
To protect a quantum system from decoherence due to interaction with its environment, we investigate the existence of initial states of the environment allowing for decoherence-fre…