Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Enabling Pulse-Level Programming, Compilation, and Execution in XACC
Thien Nguyen, A. McCaskey·Mar 26, 2020
Noisy gate-model quantum processing units (QPUs) are currently available from vendors over the cloud, and digital quantum programming approaches exist to run low-depth circuits on physical hardware. These digital representations are ultimately lowere...
Tomography of time-bin quantum states using time-resolved detection
Karolina Sedziak-Kacprowicz, A. Czerwinski, P. Kolenderski·Mar 26, 2020
We present a method for measuring quantum states encoded in temporal modes of photons. The basis for the multilevel quantum states is defined based on modes propagating in a dispersive medium, which is a fiber in this case. The propagation and time-r...
Parallel quantum simulation of large systems on small NISQ computers
F. Barratt, J. Dborin, M. Bal +3 more·Mar 26, 2020
Tensor networks permit computational and entanglement resources to be concentrated in interesting regions of Hilbert space. Implemented on NISQ machines they allow simulation of quantum systems that are much larger than the computational machine itse...
Simulating finite-time quantum isothermal processes with generic superconducting quantum circuit
Jin-Fu Chen, Ying Li, Hui Dong·Mar 25, 2020
The finite-time isothermal process is fundamental in quantum thermodynamics yet complicated with combination of changing control parameters and the interaction with the thermal bath. Such complexity prevents the direct application of the traditional ...
Scrambling and decoding the charged quantum information
Junyu Liu·Mar 25, 2020
Some deep conjectures about quantum gravity are closely related to the role of symmetries in the gravitational background, especially for quantum black holes. In this paper, we systematically study the theory of quantum information for a charged, cha...
Tensor Networks: Phase transition phenomena on hyperbolic and fractal geometries.
J. Genzor, T. Nishino, A. Gendiar·Mar 25, 2020
One of the challenging problems in the condensed matter physics is to understand the quantum many-body systems, especially, their physical mechanisms behind. Since there are only a few complete analytical solutions of these systems, several numerical...
Continuous quantum error correction for evolution under time-dependent Hamiltonians
J. Atalaya, S. Zhang, M. Niu +4 more·Mar 25, 2020
We develop a protocol for continuous operation of a quantum error correcting code for protection of coherent evolution due to an encoded Hamiltonian against environmental errors, using the three qubit bit flip code and bit flip errors as a canonical ...
A Decoder for the Color Code with Boundaries
S. Turner, Josey Hanish, Eion Blanchard +2 more·Mar 25, 2020
We introduce a decoder for the 3D color code with boundaries, which is a variation of the restriction decoder introduced by Kubicka and Delfosse. Specifically, we adapt the lift procedure to efficiently find a correction on qubits adjacent to a bound...
Quantum Semantic Learning by Reverse Annealing an Adiabatic Quantum Computer
Lorenzo Rocutto, C. Destri, E. Prati·Mar 25, 2020
Boltzmann Machines constitute a class of neural networks with applications to image reconstruction, pattern classification and unsupervised learning in general. Their most common variants, called Restricted Boltzmann Machines (RBMs) exhibit a good tr...
t|ket⟩: a retargetable compiler for NISQ devices
Seyon Sivarajah, Silas Dilkes, Alexander Cowtan +3 more·Mar 24, 2020
We present t|ket⟩, a quantum software development platform produced by Cambridge Quantum Computing Ltd. The heart of t|ket⟩ is a language-agnostic optimising compiler designed to generate code for a variety of NISQ devices, which has several features...
Information-theoretically-sound non-interactive classical verification of quantum computing with trusted center
T. Morimae·Mar 24, 2020
The posthoc verification protocol [J. F. Fitzsimons, M. Hajdu{\v s}ek, and T. Morimae, Physical Review Letters {\bf120}, 040501 (2018)] enables an information-theoretically-sound non-interactive verification of quantum computing, but the message from...
Detecting the event of a single photon loss on quantum signals
A. Mandilara, V. Akulin, Yerassyl Balkybek·Mar 24, 2020
We design a scheme for detecting a single photon loss from multi-modal quantum signals transmitted via a fiber or in free space. This consists of a special type of unitary coding transformation, the parity controlled-squeezing, applied prior to the t...
Quantum circuit-like learning: A fast and scalable classical machine-learning algorithm with similar performance to quantum circuit learning
Naoko Koide-Majima, Kei Majima·Mar 24, 2020
The application of near-term quantum devices to machine learning (ML) has attracted much attention. In one such attempt, Mitarai et al. (2018) proposed a framework to use a quantum circuit for supervised ML tasks, which is called quantum circuit lear...
The theory of entanglement-assisted metrology for quantum channels
Sisi Zhou, Liang Jiang·Mar 23, 2020
The quantum Fisher information (QFI) measures the amount of information that a quantum state carries about an unknown parameter. The (entanglement-assisted) QFI of a quantum channel is defined to be the maximum QFI of the output state assuming an ent...
Efficiently computing logical noise in quantum error-correcting codes
Stefanie J. Beale, Joel J. Wallman·Mar 23, 2020
Quantum error correction protocols have been developed to offset the high sensitivity to noise inherent in quantum systems. However, much is still unknown about the behaviour of a quantum error-correcting code under general noise, including noisy mea...
Eigen component analysis: A quantum theory incorporated machine learning technique to find linearly maximum separable components
Chen Miao, Shaohua Ma·Mar 23, 2020
For a linear system, the response to a stimulus is often superposed by its responses to other decomposed stimuli. In quantum mechanics, a state is the superposition of multiple eigenstates. Here, by taking advantage of the phase difference, a common ...
Variationally scheduled quantum simulation
S. Matsuura, S. Buck, Valentin Senicourt +1 more·Mar 22, 2020
Eigenstate preparation is ubiquitous in quantum computing, and a standard approach for generating the lowest-energy states of a given system is by employing adiabatic state preparation (ASP). In the present work, we investigate a variational method f...
Entanglement and Quaternions: The graphical calculus ZQ
Hector Miller-Bakewell·Mar 22, 2020
Graphical calculi are vital tools for representing and reasoning about quantum circuits and processes. Some are not only graphically intuitive but also logically complete. The best known of these is the ZX-calculus, which is an industry candidate for...
Koopman–von Neumann approach to quantum simulation of nonlinear classical dynamics
I. Joseph·Mar 22, 2020
Quantum computers can be used to simulate nonlinear non-Hamiltonian classical dynamics on phase space by using the generalized Koopman-von Neumann formulation of classical mechanics. The Koopman-von Neumann formulation implies that the conservation o...
Sub-system quantum dynamics using coupled cluster downfolding techniques.
K. Kowalski, Nicholas P. Bauman·Mar 21, 2020
In this paper, we discuss extending the sub-system embedding sub-algebra coupled cluster formalism and the double unitary coupled cluster (DUCC) ansatz to the time domain. An important part of the analysis is associated with proving the exactness of ...