Quantum

Paper

Self-testing with finite statistics enabling the certification of a quantum network link

Jean-Daniel Bancal, Kai Redeker, Pavel Sekatski, Wenjamin Rosenfeld, and Nicolas Sangouard,

Quantum 5, 401 (2021).

Self-testing is a method to certify devices from the result of a Bell test. Although examples of noise tolerant self-testing are known, it is not clear how to deal efficiently with a finite…

Paper

Stabilizer extent is not multiplicative

Arne Heimendahl, Felipe Montealegre-Mora, Frank Vallentin, and David Gross,

Quantum 5, 400 (2021).

The Gottesman-Knill theorem states that a Clifford circuit acting on stabilizer states can be simulated efficiently on a classical computer. Recently, this result has been generalized to cov…

Paper

A quantum algorithm for the direct estimation of the steady state of open quantum systems

Nathan Ramusat and Vincenzo Savona,

Quantum 5, 399 (2021).

Simulating the dynamics and the non-equilibrium steady state of an open quantum system are hard computational tasks on conventional computers. For the simulation of the time evolution, sever…

Paper

Non-Pauli topological stabilizer codes from twisted quantum doubles

Julio Carlos Magdalena de la Fuente, Nicolas Tarantino, and Jens Eisert,

Quantum 5, 398 (2021).

It has long been known that long-ranged entangled topological phases can be exploited to protect quantum information against unwanted local errors. Indeed, conditions for intrinsic topologic…

Paper

Resource requirements for efficient quantum communication using all-photonic graph states generated from a few matter qubits

Paul Hilaire, Edwin Barnes, and Sophia E. Economou,

Quantum 5, 397 (2021).

Quantum communication technologies show great promise for applications ranging from the secure transmission of secret messages to distributed quantum computing. Due to fiber losses, long-dis…

Paper

Cost-optimal single-qubit gate synthesis in the Clifford hierarchy

Gary J. Mooney, Charles D. Hill, and Lloyd C. L. Hollenberg,

Quantum 5, 396 (2021).

For universal quantum computation, a major challenge to overcome for practical implementation is the large amount of resources required for fault-tolerant quantum information processing. An…

Paper

Rapid mixing of path integral Monte Carlo for 1D stoquastic Hamiltonians

Elizabeth Crosson and Aram W. Harrow,

Quantum 5, 395 (2021).

Path integral quantum Monte Carlo (PIMC) is a method for estimating thermal equilibrium properties of stoquastic quantum spin systems by sampling from a classical Gibbs distribution using Ma…

Paper

Exact and approximate continuous-variable gate decompositions

Timjan Kalajdzievski and Nicolás Quesada,

Quantum 5, 394 (2021).

We gather and examine in detail gate decomposition techniques for continuous-variable quantum computers and also introduce some new techniques which expand on these methods. Both exact and a…

Paper

A resource efficient approach for quantum and classical simulations of gauge theories in particle physics

Jan F. Haase, Luca Dellantonio, Alessio Celi, Danny Paulson, Angus Kan, Karl Jansen, and Christine A. Muschik,

Quantum 5, 393 (2021).

Gauge theories establish the standard model of particle physics, and lattice gauge theory (LGT) calculations employing Markov Chain Monte Carlo (MCMC) methods have been pivotal in our unders…

Paper

Blueprint for a Scalable Photonic Fault-Tolerant Quantum Computer

J. Eli Bourassa, Rafael N. Alexander, Michael Vasmer, Ashlesha Patil, Ilan Tzitrin, Takaya Matsuura, Daiqin Su, Ben Q. Baragiola, Saikat Guha, Guillaume Dauphinais, Krishna K. Sabapathy, Nicolas C. Menicucci, and Ish Dhand,

Quantum 5, 392 (2021).

Photonics is the platform of choice to build a modular, easy-to-network quantum computer operating at room temperature. However, no concrete architecture has been presented so far that explo…

Paper

Structure optimization for parameterized quantum circuits

Mateusz Ostaszewski, Edward Grant, and Marcello Benedetti,

Quantum 5, 391 (2021).

We propose an efficient method for simultaneously optimizing both the structure and parameter values of quantum circuits with only a small computational overhead. Shallow circuits that use s…

Paper

Searching for Coherent States: From Origins to Quantum Gravity

Pierre Martin-Dussaud,

Quantum 5, 390 (2021).

We discuss the notion of coherent states from three different perspectives: the seminal approach of Schrödinger, the experimental take of quantum optics, and the theoretical developments in…

Paper

Separation of quantum, spatial quantum, and approximate quantum correlations

Salman Beigi,

Quantum 5, 389 (2021).

Quantum nonlocal correlations are generated by implementation of local quantum measurements on spatially separated quantum subsystems. Depending on the underlying mathematical model, various…

Paper

Overhead for simulating a non-local channel with local channels by quasiprobability sampling

Kosuke Mitarai and Keisuke Fujii,

Quantum 5, 388 (2021).

As the hardware technology for quantum computing advances, its possible applications are actively searched and developed. However, such applications still suffer from the noise on quantum de…

Paper

Defining quantum divergences via convex optimization

Hamza Fawzi and Omar Fawzi,

Quantum 5, 387 (2021).

We introduce a new quantum Rényi divergence $D^{\#}_{\alpha}$ for $\alpha \in (1,\infty)$ defined in terms of a convex optimization program. This divergence has several desirable computational a…

Paper

Measuring Analytic Gradients of General Quantum Evolution with the Stochastic Parameter Shift Rule

Leonardo Banchi and Gavin E. Crooks,

Quantum 5, 386 (2021).

Hybrid quantum-classical optimization algorithms represent one of the most promising application for near-term quantum computers. In these algorithms the goal is to optimize an observable qu…

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