Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Digital Simulation of Topological Matter on Programmable Quantum Processors.
F. Mei, Qihao Guo, Ya-Fei Yu +3 more·Mar 13, 2020
Simulating the topological phases of matter in synthetic quantum simulators is a topic of considerable interest. Given the universality of digital quantum simulators, the prospect of digitally simulating exotic topological phases is greatly enhanced....
Resource Efficient Zero Noise Extrapolation with Identity Insertions
Andre He, B. Nachman, W. A. Jong +1 more·Mar 10, 2020
In addition to readout errors, two-qubit gate noise is the main challenge for complex quantum algorithms on noisy intermediate-scale quantum (NISQ) computers. These errors are a significant challenge for making accurate calculations for quantum chemi...
Characterization and Tomography of a Hidden Qubit
M. Pechal, G. Salis, M. Ganzhorn +3 more·Mar 5, 2020
In circuit-based quantum computing, the available gate set typically consists of single-qubit gates acting on each individual qubit and at least one entangling gate between pairs of qubits. In certain physical architectures, however, some qubits may ...
Quantum Process Tomography of a Controlled-Phase Gate for Time-Bin Qubits
Hsin-Pin Lo, Takuya Ikuta, N. Matsuda +3 more·Mar 4, 2020
Time-bin qubits, where information is encoded in a single photon at different times, have been widely used in optical fiber and waveguide based quantum communications. With the recent developments in distributed quantum computation, it is logical to ...
Efficient Qubit Routing for a Globally Connected Trapped Ion Quantum Computer
M. Webber, Steven Herbert, S. Weidt +1 more·Feb 28, 2020
The cost of enabling connectivity in noisy intermediate‐scale quantum (NISQ) devices is an important factor in determining computational power. A qubit routing algorithm is created, which enables efficient global connectivity in a previously proposed...
On estimating the entropy of shallow circuit outputs
A. Gheorghiu, M. Hoban·Feb 27, 2020
Estimating the entropy of probability distributions and quantum states is a fundamental task in information processing. Here, we examine the hardness of this task for the case of probability distributions or quantum states produced by shallow circuit...
Quantum Algorithms for Simulating the Lattice Schwinger Model
Alexander F. Shaw, P. Lougovski, Jesse R. Stryker +1 more·Feb 25, 2020
The Schwinger model (quantum electrodynamics in 1+1 dimensions) is a testbed for the study of quantum gauge field theories. We give scalable, explicit digital quantum algorithms to simulate the lattice Schwinger model in both NISQ and fault-tolerant ...
Towards scalable bosonic quantum error correction
B. Terhal, J. Conrad, Christophe Vuillot·Feb 25, 2020
We review some of the recent efforts in devising and engineering bosonic qubits for superconducting devices, with emphasis on the Gottesman–Kitaev–Preskill (GKP) qubit. We present some new results on decoding repeated GKP error correction using finit...
Codar: A Contextual Duration-Aware Qubit Mapping for Various NISQ Devices
Haowei Deng, Yu Zhang, Quanxi Li·Feb 24, 2020
Quantum computing devices in the NISQ era share common features and challenges like limited connectivity between qubits. Since two-qubit gates are allowed on limited qubit pairs, quantum compilers must transform original quantum programs to fit the h...
Universal Fast-Flux Control of a Coherent, Low-Frequency Qubit
Helin Zhang, S. Chakram, Tanay Roy +6 more·Feb 24, 2020
The \textit{heavy-fluxonium} circuit is a promising building block for superconducting quantum processors due to its long relaxation and dephasing time at the half-flux frustration point. However, the suppressed charge matrix elements and low transit...
Hardware-Encoding Grid States in a Nonreciprocal Superconducting Circuit
Martin Rymarz, S. Bosco, A. Ciani +1 more·Feb 18, 2020
We present a circuit design composed of a non-reciprocal device and Josephson junctions whose ground space is doubly degenerate and the ground states are approximate codewords of the Gottesman-Kitaev-Preskill (GKP) code. We determine the low-energy d...
Experimental computational advantage from superposition of multiple temporal orders of quantum gates
M. M. Taddei, J. Cariñe, D. Mart'inez +9 more·Feb 18, 2020
Advanced models for quantum computation where even the circuit connections are subject to the quantum superposition principle have been recently introduced. There, a control quantum system can coherently control the order in which a target quantum sy...
High-Contrast ZZ Interaction Using Superconducting Qubits with Opposite-Sign Anharmonicity.
Peng Zhao, P. Xu, Dong Lan +4 more·Feb 18, 2020
For building a scalable quantum processor with superconducting qubits, ZZ interaction is of great concern because its residual has a crucial impact to two-qubit gate fidelity. Two-qubit gates with fidelity meeting the criterion of fault-tolerant quan...
What Limits the Simulation of Quantum Computers?
Yiqing Zhou, E. Stoudenmire, X. Waintal·Feb 18, 2020
It is imperative that useful quantum computers be very difficult to simulate classically; otherwise classical computers could be used for the applications envisioned for the quantum ones. Perfect quantum computers are unarguably exponentially difficu...
Room-temperature photonic logical qubits via second-order nonlinearities
Stefan Krastanov, M. Heuck, J. Shapiro +3 more·Feb 17, 2020
Recent progress in nonlinear optical materials and microresonators has brought quantum computing with bulk optical nonlinearities into the realm of possibility. This platform is of great interest, not only because photonics is an obvious choice for q...
A Depth-Aware Swap Insertion Scheme for the Qubit Mapping Problem
Chi Zhang, Yan-Hao Chen, Yuwei Jin +3 more·Feb 17, 2020
The rapid progress of physical implementation of quantum computers paved the way of realising the design of tools to help users write quantum programs for any given quantum devices. The physical constraints inherent to the current NISQ architectures ...
Quantum simulation of quantum field theory in the light-front formulation
Michael Kreshchuk, William M. Kirby, G. Goldstein +2 more·Feb 10, 2020
We develop quantum simulation algorithms based on the light-front formulation of relativistic quantum field theories. We analyze a simple theory in $1+1D$ and show how to compute the analogues of parton distribution functions of composite particles i...
Quantum Image Processing: the truth, the whole truth, and nothing but the truth about its problems on internal image representation and outcomes recovering
Mario Mastriani·Feb 6, 2020
In this paper, three techniques of internal image-representation in a quantum computer are compared: Flexible Representation of Quantum Images (FRQI), Novel Enhanced Quantum Representation of digital images (NEQR), and Quantum Boolean Image Processin...
Optimisation of diamond quantum processors
YunHeng Chen, Sophie Stearn, Scott Vella +2 more·Feb 3, 2020
Diamond quantum processors consisting of a nitrogen-vacancy centre and surrounding nuclear spins have been the key to significant advancements in room-temperature quantum computing, quantum sensing and microscopy. The optimisation of these processors...
Solving Vehicle Routing Problem Using Quantum Approximate Optimization Algorithm
Utkarsh Azad, B. K. Behera, Emad A. Ahmed +2 more·Feb 2, 2020
Intelligent transportation systems (ITS) are a critical component of Industry 4.0 and 5.0, particularly having applications in logistic management. One of their crucial utilization is in supply-chain management and scheduling for optimally routing tr...