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 Searchable Encryption for Cloud Data Based on Full-Blind Quantum Computation
Wenjie Liu, Yinsong Xu, Wenjie Liu +2 more·Dec 18, 2019
Searchable encryption (SE) is a positive way to protect users sensitive data in cloud computing setting, while preserving search ability on the server side, i.e., it allows the server to search encrypted data without leaking information about the pla...
Quantum natural gradient generalized to noisy and nonunitary circuits
Bálint Koczor, S. Benjamin·Dec 18, 2019
Variational quantum algorithms are promising tools whose efficacy depends on their optimisation method. For noise-free unitary circuits, the quantum generalisation of natural gradient descent has been introduced and shown to be equivalent to imaginar...
Optimised fast gates for quantum computing with trapped ions
Evan P. G. Gale, Z. Mehdi, L. Oberg +3 more·Dec 17, 2019
We present an efficient approach to optimising pulse sequences for implementing fast entangling two-qubit gates on trapped ion quantum information processors. This a two-phase procedure for optimising gate fidelity. The first phase involves a global ...
Quantum advantage from energy measurements of many-body quantum systems
Leonardo Novo, Juan Bermejo-Vega, R. Garc'ia-Patr'on·Dec 13, 2019
The problem of sampling outputs of quantum circuits has been proposed as a candidate for demonstrating a quantum computational advantage (sometimes referred to as quantum "supremacy"). In this work, we investigate whether quantum advantage demonstrat...
State preparation based on quantum phase estimation
Jian Zhao, Yuchun Wu, G. Guo +1 more·Dec 11, 2019
State preparation is a process encoding the classical data into the quantum systems. Based on quantum phase estimation, we propose the specific quantum circuits for a deterministic state preparation algorithm and a probabilistic state preparation alg...
Iterative quantum amplitude estimation
Dmitry Grinko, Julien Gacon, Christa Zoufal +1 more·Dec 11, 2019
We introduce a variant of Quantum Amplitude Estimation (QAE), called Iterative QAE (IQAE), which does not rely on Quantum Phase Estimation (QPE) but is only based on Grover’s Algorithm, which reduces the required number of qubits and gates. We provid...
Grover Adaptive Search for Constrained Polynomial Binary Optimization
Austin Gilliam, Stefan Woerner, Constantin Gonciulea·Dec 9, 2019
In this paper we discuss Grover Adaptive Search (GAS) for Constrained Polynomial Binary Optimization (CPBO) problems, and in particular, Quadratic Unconstrained Binary Optimization (QUBO) problems, as a special case. GAS can provide a quadratic speed...
Implementation of the XY interaction family with calibration of a single pulse
D. Abrams, N. Didier, Blake R. Johnson +2 more·Dec 9, 2019
Near-term applications of quantum information processors will rely on optimized circuit implementations to minimize gate depth and therefore mitigate the impact of gate errors in noisy intermediate-scale quantum (NISQ) computers. More expressive gate...
Heuristics for Quantum Compiling with a Continuous Gate Set
M. Davis, Ethan Smith, Ana Tudor +3 more·Dec 5, 2019
We present an algorithm for compiling arbitrary unitaries into a sequence of gates native to a quantum processor. As accurate CNOT gates are hard for the foreseeable Noisy- Intermediate-Scale Quantum devices era, our A* inspired algorithm attempts to...
Quantum unary approach to option pricing
Sergi Ramos-Calderer, Adrián Pérez-Salinas, Diego García-Martín +4 more·Dec 3, 2019
We present a novel quantum algorithm for European option pricing in finance, where the key idea is to work in the unary representation of the asset value. The algorithm needs novel circuitry and is divided in three parts: first, the amplitude distrib...
Quantum computation with machine-learning-controlled quantum stuff
L. Hardy, Adam G. M. Lewis·Nov 29, 2019
We formulate the control over quantum matter, so as to perform arbitrary quantum computation, as an optimization problem. We then provide a schematic machine learning algorithm for its solution. Imagine a long strip of ‘quantum stuff’, endowed with c...
Scheduler of quantum circuits based on dynamical pattern improvement and its application to hardware design
G. Guerreschi·Nov 29, 2019
As quantum hardware increases in complexity, successful algorithmic execution relies more heavily on awareness of existing device constraints. In this work we focus on the problem of routing quantum information across the machine to overcome the limi...
Path-Independent Quantum Gates with Noisy Ancilla.
Wen-Long Ma, Mengzhen Zhang, Yat Wong +5 more·Nov 27, 2019
Ancilla systems are often indispensable to universal control of a nearly isolated quantum system. However, ancilla systems are typically more vulnerable to environmental noise, which limits the performance of such ancilla-assisted quantum control. To...
Performance optimisation for drift-robust fidelity improvement of two-qubit gates.
G. White, C. Hill, L. Hollenberg·Nov 27, 2019
Quantum system characterisation techniques represent the front-line in the identification and mitigation of noise in quantum computing, but can be expensive in terms of quantum resources and time to repeatedly employ. Another challenging aspect is th...
Real-time decoding of stabilizer measurements in a bit-flip code
D. Ristè, L. Govia, Brian F. Donovan +5 more·Nov 27, 2019
Although qubit coherence times and gate fidelities are continuously improving, logical encoding is essential to achieve fault tolerance in quantum computing. In most encoding schemes, correcting or tracking errors throughout the computation is necess...
Quantum algorithms for disordered physics
A. Alexandru, P. Bedaque, S. Lawrence·Nov 25, 2019
We show how a quantum computer may efficiently simulate a disordered Hamiltonian, by incorporating a pseudo-random number generator directly into the time evolution circuit. This technique is applied to quantum simulation of few-body disordered syste...
Thermodynamic analysis of quantum error-correcting engines
G. Landi, A. L. Fonseca de Oliveira, Efrain Buksman·Nov 14, 2019
Quantum error correcting codes can be cast in a way which is strikingly similar to a quantum heat engine undergoing an Otto cycle. In this paper we strengthen this connection further by carrying out a complete assessment of the thermodynamic properti...
Variational Circuit Compiler for Quantum Error Correction
Xiaosi Xu, S. Benjamin, Xiao Yuan·Nov 13, 2019
Quantum error correction is vital for implementing universal quantum computing. A key component is the encoding circuit that maps a product state of physical qubits into the encoded multipartite entangled logical state. Known methods are typically no...
Portfolio rebalancing experiments using the Quantum Alternating Operator Ansatz
Mark Hodson, Brendan Ruck, Hugh Ong +2 more·Nov 13, 2019
This paper investigates the experimental performance of a discrete portfolio optimization problem relevant to the financial services industry on the gate-model of quantum computing. We implement and evaluate a portfolio rebalancing use case on an ide...
Quantum circuit for the fast Fourier transform
Ryo Asaka, K. Sakai, Ryoko Yahagi·Nov 8, 2019
We propose an implementation of the algorithm for the fast Fourier transform (FFT) as a quantum circuit consisting of a combination of some quantum gates. In our implementation, a data sequence is expressed by a tensor product of vector spaces. Namel...