Papers
Live trends in quantum computing research, updated daily from arXiv.
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Hardware platform mentions in abstracts — Photonic leads
Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits
Donovan Buterakos, R. Throckmorton, S. Das Sarma·Nov 6, 2017
In addition to magnetic field and electric charge noise adversely affecting spin qubit operations, performing single-qubit gates on one of multiple coupled singlet-triplet qubits presents a new challenge---crosstalk, which is inevitable (and must be ...
Noise-tolerant quantum speedups in quantum annealing without fine tuning
E. Kapit, V. Oganesyan·Oct 30, 2017
Quantum annealing is a powerful alternative model of quantum computing, which can succeed in the presence of environmental noise even without error correction. However, despite great effort, no conclusive demonstration of a quantum speedup (relative ...
Super-exponential query complexity reduction via noise-resistant quantum search
Daniel Z. Zanger·Oct 30, 2017
In the SEARCH WITH ADVICE problem, a single entry of interest within a database of N entries is to be found assuming that an ordering of the entries, from that with the highest probability of being the entry of interest (as determined by a so-called ...
Scalable Neural Network Decoders for Higher Dimensional Quantum Codes
N. P. Breuckmann, Xiaotong Ni·Oct 25, 2017
Machine learning has the potential to become an important tool in quantum error correction as it allows the decoder to adapt to the error distribution of a quantum chip. An additional motivation for using neural networks is the fact that they can be ...
Learning with Errors and Extrapolated Dihedral Cosets
Zvika Brakerski, Elena Kirshanova, D. Stehlé +1 more·Oct 23, 2017
The hardness of the learning with errors (LWE) problem is one of the most fruitful resources of modern cryptography. In particular, it is one of the most prominent candidates for secure post-quantum cryptography. Understanding its quantum complexity ...
Learning time-dependent noise to reduce logical errors: real time error rate estimation in quantum error correction
M. Huo, Ying Li·Oct 10, 2017
Quantum error correction is important to quantum information processing, which allows us to reliably process information encoded in quantum error correction codes. Efficient quantum error correction benefits from the knowledge of error rates. We prop...
Correcting coherent errors with surface codes
S. Bravyi, Matthias Englbrecht, R. König +1 more·Oct 6, 2017
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 the surface code is usually estimated by simulating toy noise models desc...
Simulating the performance of a distance-3 surface code in a linear ion trap
Colin J. Trout, Muyuan Li, Mauricio Gutiérrez +4 more·Oct 3, 2017
We explore the feasibility of implementing a small surface code with 9 data qubits and 8 ancilla qubits, commonly referred to as surface-17, using a linear chain of 171Yb+ ions. Two-qubit gates can be performed between any two ions in the chain with ...
Quantum qubit switch: entropy and entanglement
Marek Sawerwain, Joanna Wi'sniewska·Sep 7, 2017
The quantum entanglement is considered as one of the most important notions of quantum computing. The entanglement is a feature of quantum systems and it is used as a basis for many quantum algorithms and protocols. In this paper we analyze the level...
Passive quantum error correction of linear optics networks through error averaging
Ryan J. Marshman, A. Lund, P. Rohde +1 more·Sep 7, 2017
We propose and investigate a method of error detection and noise correction for bosonic linear networks using a method of unitary averaging. The proposed error averaging does not rely on ancillary photons or control and feedforward correction circuit...
Repetition code of 15 qubits
James R. Wootton, D. Loss·Sep 4, 2017
The repetition code is an important primitive for the techniques of quantum error correction. Here we implement repetition codes of at most 15 qubits on the 16 qubit ibmqx3 device. Each experiment is run for a single round of syndrome measurements, a...
Approaches for approximate additivity of the Holevo information of quantum channels
Felix Leditzky, Eneet Kaur, N. Datta +1 more·Sep 4, 2017
We study quantum channels that are close to another channel with weakly additive Holevo information and derive upper bounds on their classical capacity. Examples of channels with weakly additive Holevo information are entanglement-breaking channels, ...
Quantum search with hybrid adiabatic–quantum-walk algorithms and realistic noise
J. Morley, N. Chancellor, S. Bose +2 more·Sep 1, 2017
Computing using a continuous-time evolution, based on the natural interaction Hamiltonian of the quantum computer hardware, is a promising route to building useful quantum computers in the near term. Adiabatic quantum computing, quantum annealing, co...
Tight upper bound for the maximal quantum value of the Svetlichny operators
Ming Li, Shuqian Shen, N. Jing +2 more·Aug 28, 2017
It is a challenging task to detect genuine multipartite nolocality (GMNL). In this paper, the problem is considered via computing the maximal quantum value of Svetlichny operators for three-qubit systems and a tight upper bound is obtained. The const...
Ultrahigh Error Threshold for Surface Codes with Biased Noise.
David K. Tuckett, S. Bartlett, S. Flammia·Aug 28, 2017
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 than X or Y errors. Such biased noise, where dephasing dominates, is...
Three-Dimensional Color Code Thresholds via Statistical-Mechanical Mapping.
Aleksander Kubica, M. Beverland, F. Brandão +2 more·Aug 23, 2017
Three-dimensional (3D) color codes have advantages for fault-tolerant quantum computing, such as protected quantum gates with relatively low overhead and robustness against imperfect measurement of error syndromes. Here we investigate the storage thr...
Spatial noise filtering through error correction for quantum sensing
David Layden, P. Cappellaro·Aug 22, 2017
Quantum systems can be used to measure various quantities in their environment with high precision. Often, however, their sensitivity is limited by the decohering effects of this same environment. Dynamical decoupling schemes are widely used to filte...
Resonantly driven CNOT gate for electron spins
D. M. Zajac, A. Sigillito, M. Russ +5 more·Aug 11, 2017
Building an essential quantum component To build a universal quantum computer—the kind that can handle any computational task you throw at it—an essential early step is to demonstrate the so-called CNOT gate, which acts on two qubits. Zajac et al. bu...
Coherence properties of the 0-π qubit
Peter Groszkowski, A. Paolo, A. Grimsmo +5 more·Aug 9, 2017
Superconducting circuits rank among some of the most interesting architectures for the implementation of quantum information processing devices. The recently proposed 0-π qubit (Brooks et al 2013 Phys. Rev. A 87 52306) promises increased protection f...
Automated error correction in IBM quantum computer and explicit generalization
D. Ghosh, Pratik Agarwal, P. Pandey +2 more·Aug 7, 2017
Construction of a fault-tolerant quantum computer remains a challenging problem due to unavoidable noise and fragile quantum states. However, this goal can be achieved by introducing quantum error-correcting codes. Here, we experimentally realize an ...