Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
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 ...
Hadamard-Free Circuits Expose the Structure of the Clifford Group
S. Bravyi, D. Maslov·Mar 20, 2020
The Clifford group plays a central role in quantum randomized benchmarking, quantum tomography, and error correction protocols. Here we study the structural properties of this group. We show that any Clifford operator can be uniquely written in the c...
Quantum $k$-nearest neighbors algorithm
Afrad Basheer, A. Afham, S. Goyal·Mar 20, 2020
One of the simplest and most effective classical machine learning algorithms is the $k$-nearest neighbors algorithm ($k$NN) which classifies an unknown test state by finding the $k$ nearest neighbors from a set of $M$ train states. Here we present a ...
Quantum noise protects quantum classifiers against adversaries
Yuxuan Du, Min-Hsiu Hsieh, Tongliang Liu +2 more·Mar 20, 2020
Noise in quantum information processing is often viewed as a disruptive and difficult-to-avoid feature, especially in near-term quantum technologies. However, noise has often played beneficial roles, from enhancing weak signals in stochastic resonanc...
Trapped Rydberg ions: A new platform for quantum information processing
A. Mokhberi, M. Hennrich, F. Schmidt-Kaler·Mar 19, 2020
Abstract In this chapter, we present an overview of experiments with trapped Rydberg ions and outline the advantages and challenges of developing applications of this new platform for quantum computing, sensing, and simulation. Trapped Rydberg ions f...
Scalable integrated single-photon source
R. Uppu, Freja T. Pedersen, Ying Wang +8 more·Mar 19, 2020
An on-chip deterministic source generating more than 100 identical photons meets the resource requirement for quantum advantage. Photonic qubits are key enablers for quantum information processing deployable across a distributed quantum network. An o...
Elimination of unwanted qubit interactions for parametric exchange two-qubit gates in a tunable coupling circuit
X. Han, T. Cai, X. Li +6 more·Mar 19, 2020
We experimentally demonstrate a simple-design tunable coupler, achieving a continuous tunability for eliminating unwanted qubit interactions. We implement two-qubit iSWAP gate by applying a fast-flux bias modulation pulse on the coupler to turn on pa...
A Phononic Bus for Coherent Interfaces Between a Superconducting Quantum Processor, Spin Memory, and Photonic Quantum Networks
T. Neuman, M. Eichenfield, Matthew E. Trusheim +3 more·Mar 18, 2020
We introduce a method for high-fidelity quantum state transduction between a superconducting microwave qubit and the ground state spin system of a solid-state artificial atom, mediated via an acoustic bus connected by piezoelectric transducers. Appli...
Intuitive Understanding of Quantum Computation and Post-Quantum Cryptography
Quan Thoi Minh Nguyen·Mar 18, 2020
Post-quantum cryptography is inevitable. National Institute of Standards and Technology (NIST) starts standardizing quantum-resistant public-key cryptography (aka post-quantum cryptography). The reason is that investment in quantum computing is bloom...
A femto-Tesla DC SQUID design for quantum-ready readouts
I. Sochnikov, D. Davino, B. Kalisky·Mar 17, 2020
Among some of the current uses of the DC Superconducting QUantum Interference Devices (SQUIDs) are qubit-readouts and sensors for probing properties of quantum materials. We present a rather unique gradiometric niobium SQUID design with state-of-the-...
Restricted Boltzmann machine representation for the groundstate and excited states of Kitaev Honeycomb model
Mohammadreza Noormandipour, Youran Sun, Babak Haghighat·Mar 16, 2020
In this work, the capability of restricted Boltzmann machines (RBMs) to find solutions for the Kitaev honeycomb model with periodic boundary conditions is investigated. The measured groundstate energy of the system is compared and, for small lattice ...
Polynomial scaling of QAOA for ground-state preparation: taming first-order phase transitions
Matteo M. Wauters, G. Mbeng, G. Santoro·Mar 16, 2020
We show that the quantum approximate optimization algorithm (QAOA) can construct with polynomially scaling resources the ground state of the fully-connected p-spin Ising ferromagnet, a problem that notoriously poses severe difficulties to a Quantum A...
Universal and optimal coin sequences for high entanglement generation in 1D discrete time quantum walks
A. Gratsea, F. Metz, T. Busch·Mar 16, 2020
Entanglement is a key resource in many quantum information applications and achieving high values independently of the initial conditions is an important task. Here we address the problem of generating highly entangled states in a discrete time quant...
Hamiltonian simulation algorithms for near-term quantum hardware
Laura Clinton, Johannes Bausch, T. Cubitt·Mar 15, 2020
The quantum circuit model is the de-facto way of designing quantum algorithms. Yet any level of abstraction away from the underlying hardware incurs overhead. In this work, we develop quantum algorithms for Hamiltonian simulation "one level below” th...
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....
Consequences of preserving reversibility in quantum superchannels
Wataru Yokojima, Marco T'ulio Quintino, A. Soeda +1 more·Mar 12, 2020
Similarly to quantum states, quantum operations can also be transformed by means of quantum superchannels, also known as process matrices. Quantum superchannels with multiple slots are deterministic transformations which take causally independent qua...
Cross Entropy Hyperparameter Optimization for Constrained Problem Hamiltonians Applied to QAOA
Christoph Roch, Alexander Impertro, Thomy Phan +3 more·Mar 11, 2020
Hybrid quantum-classical algorithms such as the Quantum Approximate Optimization Algorithm (QAOA) are considered as one of the most encouraging approaches for taking advantage of near-term quantum computers in practical applications. Such algorithms ...
The ghost in the radiation: robust encodings of the black hole interior
Isaac H. Kim, Eugene Tang, J. Preskill·Mar 11, 2020
We reconsider the black hole firewall puzzle, emphasizing that quantum error- correction, computational complexity, and pseudorandomness are crucial concepts for understanding the black hole interior. We assume that the Hawking radiation emitted by a...
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...
Circuit design for clique problem and its implementation on quantum computer
Arpita Sanyal, A. Saha, Banani Saha +1 more·Mar 10, 2020
Finding cliques in a graph has several applications for its pattern matching ability. $k$-clique problem, a special case of clique problem, determines whether an arbitrary graph contains a clique of size $k$, has already been addressed in quantum dom...