Papers
Live trends in quantum computing research, updated daily from arXiv.
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Qubit Platforms
Hardware platform mentions in abstracts — Photonic leads
Measurement-induced steering of quantum systems
Sthitadhi Roy, J. Chalker, I. Gornyi +2 more·Dec 9, 2019
We set out a general protocol for steering the state of a quantum system from an arbitrary initial state towards a chosen target state by coupling it to auxiliary quantum degrees of freedom. The protocol requires multiple repetitions of an elementary...
Highly Transparent Contacts to the 1D Hole Gas in Ultra-Scaled Ge/Si Core/Shell Nanowires.
M. Sistani, Jovian Delaforce, R. Kramer +10 more·Dec 9, 2019
Semiconductor-superconductor hybrid systems have outstanding potential for emerging high performance nanoelectronics and quantum devices. However, critical to their successful application is the fabrication of high quality and reproducible semiconduc...
Light-Driven Raman Coherence as a Nonthermal Route to Ultrafast Topology Switching in a Dirac Semimetal
C. Vaswani, Lin-Lin Wang, D. Mudiyanselage +14 more·Dec 4, 2019
A grand challenge underlies the entire field of topology-enabled quantum logic and information science: how to establish topological control principles driven by quantum coherence and understand the time-dependence of such periodic driving? Here we d...
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...
Protecting quantum coherences from static noise and disorder
Chahan M. Kropf·Nov 26, 2019
Quantum coherences are paramount resources for applications, such as quantum-enhanced light-harvesting or quantum computing, which are fragile against environmental noise. We here derive generalized quantum master equations using perturbation theory ...
Charge-density-wave melting in the one-dimensional Holstein model
J. Stolpp, J. Herbrych, F. Dorfner +2 more·Nov 5, 2019
We study the Holstein model of spinless fermions, which at half filling exhibits a quantum phase transition from a metallic Tomonaga-Luttinger liquid phase to an insulating charge-density-wave (CDW) phase at a critical electron-phonon coupling streng...
Quantum equation of motion for computing molecular excitation energies on a noisy quantum processor
Pauline J. Ollitrault, A. Kandala, Chun-Fu Chen +7 more·Oct 28, 2019
The computation of molecular excitation energies is essential for predicting photo-induced reactions of chemical and technological interest. While the classical computing resources needed for this task scale poorly, quantum algorithms emerge as promi...
Scalable Probes of Measurement-Induced Criticality.
M. Gullans, D. Huse·Sep 30, 2019
We uncover a local order parameter for measurement-induced phase transitions: the average entropy of a single reference qubit initially entangled with the system. Using this order parameter, we identify scalable probes of measurement-induced critical...
Adiabatic electron charge transfer between two quantum dots in presence of 1/f noise
Jan A. Krzywda, Ł. Cywiński·Sep 25, 2019
Controlled transfer of a single electron through a chain of quantum dots has been recently achieved in GaAs and Si/SiGe based quantum dots, opening prospects for turning stationary spin qubits into mobile ones, and solving in this way the problem of ...
Dynamically corrected gates suppressing spatiotemporal error correlations as measured by randomized benchmarking
C. Edmunds, Cornelius Hempel, R. Harris +3 more·Sep 24, 2019
Quantum error correction provides a path to large-scale quantum computers, but is built on challenging assumptions about the characteristics of the underlying errors. In particular, the mathematical assumption of statistically independent errors in q...
Measurement-induced randomness and structure in controlled qubit processes.
A. Venegas-Li, Alexandra M. Jurgens, J. Crutchfield·Aug 24, 2019
When an experimentalist measures a time series of qubits, the outcomes constitute a classical stochastic process. We show that projective measurement induces high complexity in these processes in two specific senses: They are inherently random (finit...
Optimal clock speed of qubit gate operations on open quantum systems
Nilanjana Chanda, R. Bhattacharyya·Aug 1, 2019
Efficient implementation of quantum algorithms requires single- or multiple-qubit gates with high fidelity. Here we report that the fidelity of gate operations on open quantum systems has a maximum value corresponding to an optimum value of the drive...
Error-corrected gates on an encoded qubit
P. Reinhold, Serge Rosenblum, Wen-Long Ma +3 more·Jul 29, 2019
To reach their full potential, quantum computers need to be resilient to noise and decoherence. In such a fault-tolerant quantum computer, errors must be corrected in real time to prevent them from propagating between components1,2. This requirement ...
Quantum error correction of a qubit encoded in grid states of an oscillator
P. Campagne-Ibarcq, A. Eickbusch, S. Touzard +10 more·Jul 29, 2019
The accuracy of logical operations on quantum bits (qubits) must be improved for quantum computers to outperform classical ones in useful tasks. One method to achieve this is quantum error correction (QEC), which prevents noise in the underlying syst...
Quantum channel correction with twisted light using compressive sensing
C. Mabena, F. S. Roux·Jul 17, 2019
Compressive sensing is used to perform high-dimensional quantum channel estimation with classical light. As an example, we perform a numerical simulation for the case of a three-dimensional classically non-separable state that is propagated through a...
The formation of intermediate layers in covered Ge/Si heterostructures with low-temperature quantum dots: a study using high-resolution transmission electron microscopy and Raman spectroscopy
M. S. Storozhevykh, L. V. Arapkina, S. Novikov +3 more·Jul 16, 2019
The method of software analysis of high-resolution TEM images using the peak pairs algorithm [Galindo P L et al 2007 Ultramicroscopy 107 1186–93] in combination with Raman spectroscopy was employed to study lattice deformations in Ge/Si(001) structur...
Set of holonomic and protected gates on topological qubits for a realistic quantum computer
A. Klots, L. Ioffe·Jul 9, 2019
In recent years qubit designs such as transmons approached the fidelities of up to 0.999. However, even these devices are still insufficient for realizing quantum error correction requiring better than 0.9999 fidelity. Topologically protected superco...
Optimizing the Spin Reversal Transform on the D-Wave 2000Q
Elijah Pelofske, Georg Hahn, H. Djidjev·Jun 26, 2019
Commercial quantum annealers from D-Wave Systems make it possible to obtain approximate solutions of high quality for certain NP-hard problems in nearly constant time. Before solving a problem on D-Wave, several pre-processing methods can be applied,...
High-fidelity single-qubit gates in a strongly driven quantum-dot hybrid qubit with1/fcharge noise
Yuan-Chi Yang, S. Coppersmith, M. Friesen·Jun 19, 2019
Semiconductor double quantum dot hybrid qubits are promising candidates for high-fidelity quantum computing. However, their performance is limited by charge noise, which is ubiquitous in solid-state devices, and phonon-induced dephasing. Here we expl...
Optimizing QAOA: Success Probability and Runtime Dependence on Circuit Depth
M. Niu, Sirui Lu, I. Chuang·May 28, 2019
The quantum approximate optimization algorithm~(QAOA) first proposed by Farhi et al. promises near-term applications based on its simplicity, universality, and provable optimality. A depth-p QAOA consists of p interleaved unitary transformations indu...