Encoding electronic spectra in quantum circuits with linear T complexity
We construct quantum circuits that exactly encode the spectra of correlated electron models
up to errors from rotation synthesis. By invoking these circuits as oracles within the recently …
up to errors from rotation synthesis. By invoking these circuits as oracles within the recently …
Equivalence of restricted Boltzmann machines and tensor network states
The restricted Boltzmann machine (RBM) is one of the fundamental building blocks of deep
learning. RBM finds wide applications in dimensional reduction, feature extraction, and …
learning. RBM finds wide applications in dimensional reduction, feature extraction, and …
Halving the cost of quantum addition
C Gidney - Quantum, 2018 - quantum-journal.org
We improve the number of T gates needed to perform an n-bit adder from $8 n+ O (1) $ to $4
n+ O (1) $. We do so via a" temporary logical-AND" construction which uses four T gates to …
n+ O (1) $. We do so via a" temporary logical-AND" construction which uses four T gates to …
Ultrahigh error threshold for surface codes with biased noise
We show that a simple modification of the surface code can exhibit an enormous gain in the
error correction threshold for a noise model in which Pauli Z errors occur more frequently …
error correction threshold for a noise model in which Pauli Z errors occur more frequently …
Optimizing the nonlinearity and dissipation of a snail parametric amplifier for dynamic range
We present a quantum-limited Josephson-junction-based three-wave-mixing parametric
amplifier, the superconducting nonlinear asymmetric inductive element (SNAIL) parametric …
amplifier, the superconducting nonlinear asymmetric inductive element (SNAIL) parametric …
[HTML][HTML] Flag fault-tolerant error correction with arbitrary distance codes
C Chamberland, ME Beverland - Quantum, 2018 - quantum-journal.org
In this paper we introduce a general fault-tolerant quantum error correction protocol using
flag circuits for measuring stabilizers of arbitrary distance codes. In addition to extending flag …
flag circuits for measuring stabilizers of arbitrary distance codes. In addition to extending flag …
[HTML][HTML] Machine-learning-assisted correction of correlated qubit errors in a topological code
A fault-tolerant quantum computation requires an efficient means to detect and correct errors
that accumulate in encoded quantum information. In the context of machine learning, neural …
that accumulate in encoded quantum information. In the context of machine learning, neural …
Correcting coherent errors with surface codes
Surface codes are building blocks of quantum computing platforms based on 2D arrays of
qubits responsible for detecting and correcting errors. The error suppression achieved by …
qubits responsible for detecting and correcting errors. The error suppression achieved by …
Deep neural decoders for near term fault-tolerant experiments
C Chamberland, P Ronagh - Quantum Science and Technology, 2018 - iopscience.iop.org
Finding efficient decoders for quantum error correcting codes adapted to realistic
experimental noise in fault-tolerant devices represents a significant challenge. In this paper …
experimental noise in fault-tolerant devices represents a significant challenge. In this paper …
Lattice surgery with a twist: simplifying clifford gates of surface codes
D Litinski, F von Oppen - Quantum, 2018 - quantum-journal.org
We present a planar surface-code-based scheme for fault-tolerant quantum computation
which eliminates the time overhead of single-qubit Clifford gates, and implements long …
which eliminates the time overhead of single-qubit Clifford gates, and implements long …