Error suppression in adiabatic quantum computing with qubit ensembles

  title={Error suppression in adiabatic quantum computing with qubit ensembles},
  author={Naeimeh Mohseni and Marek Narozniak and Alexey N. Pyrkov and Valentin Ivannikov and Jonathan P.Dowling and Tim Byrnes},
  journal={npj Quantum Information},
Incorporating protection against quantum errors into adiabatic quantum computing (AQC) is an important task due to the inevitable presence of decoherence. Here, we investigate an error-protected encoding of the AQC Hamiltonian, where qubit ensembles are used in place of qubits. Our Hamiltonian only involves total spin operators of the ensembles, offering a simpler route towards error-corrected quantum computing. Our scheme is particularly suited to neutral atomic gases where it is possible to… Expand

Figures from this paper

EQUAL: Improving the Fidelity of Quantum Annealers by Injecting Controlled Perturbations
EQUAL generates an ensemble of QMIs by adding controlled perturbations to the program QMI, which steers the program away from encountering the same bias during all trials and thus, improves the quality of solutions. Expand
Magnon Bose-Einstein condensate based qubit calculus
We propose to enable a set of room-temperature quantum computing functionalities using two roomtemperature magnon Bose–Einstein condensates (BECs) existing at two distinct wavevectors in anExpand
The Renewed Role of Sweep Functions in Noisy Shortcuts to Adiabaticity
It is observed that, according to the decay and dephasing channels investigated here, the performance of the system becomes highly dependent on the sweep function. Expand
Deep recurrent networks predicting the gap evolution in adiabatic quantum computing
Naeimeh Mohseni, 2 Carlos Navarrete-Benlloch, 4, 1 Tim Byrnes, 6, 7, 8, 9, ∗ and Florian Marquardt 2 Max-Planck-Institut für die Physik des Lichts, Staudtstrasse 2, 91058 Erlangen, Germany PhysicsExpand
Quantum Atom Optics: Theory and Applications to Quantum Technology
This is a pre-publication version of a forthcoming book on quantum atom optics. It is written as a senior undergraduate to junior graduate level textbook, assuming knowledge of basic quantumExpand
Experimental observation of Josephson oscillations in a room-temperature Bose-Einstein magnon condensate
The alternating current (ac) Josephson effect in a time-independent spatially-inhomogeneous setting is manifested by the occurrence of Josephson oscillations - periodic macroscopic phase-inducedExpand


Error-corrected quantum annealing with hundreds of qubits.
A substantial improvement over the performance of the processors in the absence of error correction is demonstrated, paving the way towards large-scale noise-protected adiabatic quantum optimization devices, although a threshold theorem such as has been established in the circuit model of quantum computing remains elusive. Expand
Decoherence induced deformation of the ground state in adiabatic quantum computation
Despite more than a decade of research on adiabatic quantum computation (AQC), its decoherence properties are still poorly understood. Many theoretical works have suggested that AQC is more robustExpand
Nested Quantum Annealing Correction
Errors that rob quantum optimizers of their processing power can be critically reduced with a family of geometrically nested codes. Quantum annealing is a computing technique that harnesses quantumExpand
Quantum and classical dynamics in adiabatic computation
Adiabatic transport provides a powerful way to manipulate quantum states. By preparing a system in a readily initialized state and then slowly changing its Hamiltonian, one may achieve quantum statesExpand
Implementing the Deutsch-Jozsa algorithm with macroscopic ensembles
Quantum computing implementations under consideration today typically deal with systems with microscopic degrees of freedom such as photons, ions, cold atoms, and superconducting circuits. TheExpand
Error suppression and error correction in adiabatic quantum computation: non-equilibrium dynamics
A model for describing the dynamics of encoded AQC is derived and it is shown that previous constructions for error suppression can be unified with this dynamical model, which clarifies the mechanisms of error suppression and allows the identification of its weaknesses. Expand
Experimental signature of programmable quantum annealing.
This experiment uses groups of eight superconducting flux qubits with programmable spin-spin couplings, embedded on a commercially available chip with >100 functional qubits, and suggests that programmable quantum devices, scalable with currentsuperconducting technology, implement quantum annealing with a surprising robustness against noise and imperfections. Expand
Macroscopic quantum information processing using spin coherent states
Abstract Previously a new scheme of quantum information processing based on spin coherent states of two component Bose–Einstein condensates was proposed (Byrnes et al. Phys. Rev. A 85, 40306(R)). InExpand
Quantum error correction for quantum memories
It may seem inevitable that highly entangled quantum states are susceptible to disturbance through interaction with a decohering environment. However, certain multiqubit entangled states are wellExpand
Decoherence in adiabatic quantum computation
We have studied the decoherence properties of adiabatic quantum computation (AQC) in the presence of in general non-Markovian, e.g., low-frequency, noise. The developed description of the incoherentExpand