Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Quantum Circuit Transformation Based on Simulated Annealing and Heuristic Search
Xiang-Yu Zhou, Sanjiang Li, Yuan Feng·Aug 23, 2019
Quantum algorithm design usually assumes access to a perfect quantum computer with ideal properties like full connectivity, noise-freedom, and arbitrarily long coherence time. In noisy intermediate-scale quantum (NISQ) devices, however, the number of...
Efficient quantum measurement of Pauli operators
O. Crawford, B. V. Straaten, Daochen Wang +3 more·Aug 19, 2019
Estimating the expectation value of an observable is a fundamental task in quantum computation. Unfortunately, it is often impossible to obtain such estimates directly, as the computer is restricted to measuring in a fixed computational basis. One co...
Nearly Optimal Measurement Scheduling for Partial Tomography of Quantum States
Xavier Bonet-Monroig, R. Babbush, T. O’Brien·Aug 15, 2019
Many applications of quantum simulation require to prepare and then characterize quantum states by performing an efficient partial tomography to estimate observables corresponding to $k$-body reduced density matrices ($k$-RDMs). For instance, variati...
Timing and Resource-Aware Mapping of Quantum Circuits to Superconducting Processors
L. Lao, Hans van Someren, I. Ashraf +1 more·Aug 12, 2019
Quantum algorithms need to be compiled to respect the constraints imposed by quantum processors, which is known as the mapping problem. The mapping procedure will result in an increase of the number of gates and of the circuit latency, decreasing the...
Sapphire: A Configurable Crypto-Processor for Post-Quantum Lattice-based Protocols
Utsav Banerjee, T. Ukyab, A. Chandrakasan·Aug 9, 2019
Public key cryptography protocols, such as RSA and elliptic curve cryptography, will be rendered insecure by Shor’s algorithm when large-scale quantum computers are built. Cryptographers are working on quantum-resistant algorithms, and lattice-based ...
The Role of Multiplicative Complexity in Compiling Low $T$-count Oracle Circuits
Giulia Meuli, Mathias Soeken, E. Campbell +2 more·Aug 5, 2019
We present a constructive method to create quantum circuits that implement oracles <tex>$\vert x\rangle\vert y\rangle\vert 0\rangle^{k}\mapsto\vert x\rangle\vert y\oplus f(x)\rangle\vert 0\rangle^{k}$</tex> for <tex>$n$</tex>-variable Boolean functio...
Scalable preparation of Dicke states for quantum sensing
M. Johnsson, Nabomita Roy Mukty, D. Burgarth +2 more·Aug 3, 2019
We present a quantum control strategy for preparing Dicke states on spin ensembles for use in superabsorption and precision metrology. The method uses a dispersive coupling of $n$ spins to a common bosonic mode and does not require selective addressi...
Machine-learning based three-qubit gate for realization of a Toffoli gate with cQED-based transmon systems
Sahar Daraeizadeh, S. Premaratne, Xiaoyu Song +2 more·Aug 2, 2019
We use machine learning techniques to design a 50 ns three-qubit flux-tunable controlled-controlled-phase gate with fidelity of>99.99% for nearest-neighbor coupled transmons in circuit quantum electrodynamics architectures. We explain our gate design...
Optimal clock speed of qubit gate operations on open quantum systems
Nilanjana Chanda, R. Bhattacharyya·Aug 1, 2019
Efficient implementation of quantum algorithms requires single- or multiple-qubit gates with high fidelity. Here we report that the fidelity of gate operations on open quantum systems has a maximum value corresponding to an optimum value of the drive...
Efficient Estimation of Pauli Channels
S. Flammia, Joel J. Wallman·Jul 30, 2019
Pauli channels are ubiquitous in quantum information, both as a dominant noise source in many computing architectures and as a practical model for analyzing error correction and fault tolerance. Here, we prove several results on efficiently learning ...
Error-corrected gates on an encoded qubit
P. Reinhold, Serge Rosenblum, Wen-Long Ma +3 more·Jul 29, 2019
To reach their full potential, quantum computers need to be resilient to noise and decoherence. In such a fault-tolerant quantum computer, errors must be corrected in real time to prevent them from propagating between components1,2. This requirement ...
Practical trapped-ion protocols for universal qudit-based quantum computing
Pei Jiang Low, Brendan M. White, Andrew A. Cox +2 more·Jul 19, 2019
The notion of universal quantum computation can be generalized to multi-level qudits, which offer advantages in resource usage and algorithmic efficiencies. Trapped ions, which are pristine and well-controlled quantum systems, offer an ideal platform...
Photonic quantum information processing: A concise review
S. Slussarenko, G. Pryde·Jul 15, 2019
Photons have been a flagship system for studying quantum mechanics, advancing quantum information science, and developing quantum technologies. Quantum entanglement, teleportation, quantum key distribution and early quantum computing demonstrations w...
Experimental exploration of five-qubit quantum error-correcting code with superconducting qubits
M. Gong, Xiao Yuan, Shiyu Wang +19 more·Jul 10, 2019
Abstract Quantum error correction is an essential ingredient for universal quantum computing. Despite tremendous experimental efforts in the study of quantum error correction, to date, there has been no demonstration in the realisation of universal q...
Set of holonomic and protected gates on topological qubits for a realistic quantum computer
A. Klots, L. Ioffe·Jul 9, 2019
In recent years qubit designs such as transmons approached the fidelities of up to 0.999. However, even these devices are still insufficient for realizing quantum error correction requiring better than 0.9999 fidelity. Topologically protected superco...
Universal quantum computing using single-particle discrete-time quantum walk
Shivani Singh, Prateek Chawla, Anupam Sarkar +1 more·Jul 9, 2019
Quantum walk has been regarded as a primitive to universal quantum computation. In this paper, we demonstrate the realization of the universal set of quantum gates on two- and three-qubit systems by using the operations required to describe the singl...
Optimization of Quantum Circuit Mapping using Gate Transformation and Commutation
Toshinari Itoko, Raymond H. Putra, T. Imamichi +1 more·Jul 5, 2019
This paper addresses quantum circuit mapping for Noisy Intermediate-Scale Quantum (NISQ) computers. Since NISQ computers constraint two-qubit operations on limited couplings, an input circuit must be transformed into an equivalent output circuit obey...
Resource reduction for distributed quantum information processing using quantum multiplexed photons
N. Piparo, M. Hanks, C. Gravel +2 more·Jul 4, 2019
Distributed quantum information processing is based on the transmission of quantum data over lossy channels between quantum processing nodes. These nodes may be separated by a few microns or on planetary scale distances, but transmission losses due t...
Quantum walks as mathematical foundation for quantum gates
D. Solenov·Jun 27, 2019
It is demonstrated that in gate-based quantum computing architectures quantum walk is a natural mathematical description of quantum gates. It originates from field-matter interaction driving the system, but is not attached to specific qubit designs a...
Quantum Phase Estimation with Time‐Frequency Qudits in a Single Photon
Hsuan-Hao Lu, Zixuan Hu, Mohammed S. Alshaykh +5 more·Jun 27, 2019
The Phase Estimation Algorithm (PEA) is an important quantum algorithm used independently or as a key subroutine in other quantum algorithms. Currently most implementations of the PEA are based on qubits, where the computational units in the quantum ...