1.3k citations · 21.7k across the 114 of their papers we have counts for
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Verifiable measurement-based quantum random sampling with trapped ions
Martin Ringbauer, Marcel Hinsche, Thomas Feldker +13
Quantum computers are now on the brink of outperforming their classical counterparts. One way to demonstrate the advantage of quantum computation is through quantum random sampling…
Exploring Large-Scale Entanglement in Quantum Simulation
Manoj K. Joshi, Christian Kokail, Rick van Bijnen +5
Entanglement is a distinguishing feature of quantum many-body systems, and uncovering the entanglement structure for large particle numbers in quantum simulation experiments is a f…
Quantum-enhanced sensing on an optical transition via emergent collective quantum correlations
Johannes Franke, Sean R. Muleady, Raphael Kaubruegger +5
The control over quantum states in atomic systems has led to the most precise optical atomic clocks to date. Their sensitivity is currently bounded by the standard quantum limit, a…
Experimental realization of nonunitary multi-qubit operations
Martin W. van Mourik, Elias Zapusek, Pavel Hrmo +5
We demonstrate a novel experimental toolset that enables irreversible multi-qubit operations on a quantum platform. To exemplify our approach, we realize two elementary nonunitary…
Observation of magnon bound states in the long-range, anisotropic Heisenberg model
Florian Kranzl, Stefan Birnkammer, Manoj K. Joshi +4
Over the recent years coherent, time-periodic modulation has been established as a versatile tool for realizing novel Hamiltonians. Using this approach, known as Floquet engineerin…
Reconstructing complex states of a 20-qubit quantum simulator
Murali K. Kurmapu, V. V. Tiunova, E. S. Tiunov +6
A prerequisite to the successful development of quantum computers and simulators is precise understanding of physical processes occurring therein, which can be achieved by measurin…
Native qudit entanglement in a trapped ion quantum processor
Pavel Hrmo, Benjamin Wilhelm, Lukas Gerster +6
Quantum information carriers, just like most physical systems, naturally occupy high-dimensional Hilbert spaces. Instead of restricting them to a two-level subspace, these high-dim…
Experimental single-setting quantum state tomography
Roman Stricker, Michael Meth, Lukas Postler +7
Quantum computers solve ever more complex tasks using steadily growing system sizes. Characterizing these quantum systems is vital, yet becoming increasingly challenging. The gold-…
Approaching optimal entangling collective measurements on quantum computing platforms
Lorcan O. Conlon, Tobias Vogl, Christian D. Marciniak +9
Entanglement is a fundamental feature of quantum mechanics and holds great promise for enhancing metrology and communications. Much of the focus of quantum metrology so far has bee…
Probing phases of quantum matter with an ion-trap tensor-network quantum eigensolver
Michael Meth, Viacheslav Kuzmin, Rick van Bijnen +7
Tensor-Network (TN) states are efficient parametric representations of ground states of local quantum Hamiltonians extensively used in numerical simulations. Here we encode a TN an…
Towards experimental classical verification of quantum computation
Roman Stricker, Jose Carrasco, Martin Ringbauer +8
With today's quantum processors venturing into regimes beyond the capabilities of classical devices [1-3], we face the challenge to verify that these devices perform as intended, e…
Experimental observation of thermalization with noncommuting charges
Florian Kranzl, Aleksander Lasek, Manoj K. Joshi +4
Quantum simulators have recently enabled experimental observations of quantum many-body systems' internal thermalization. Often, the global energy and particle number are conserved…
Controlling long ion strings for quantum simulation and precision measurements
Florian Kranzl, Manoj K. Joshi, Christine Maier +4
Scaling a trapped-ion based quantum simulator to a large number of ions creates a fully-controllable quantum system that becomes inaccessible to numerical methods. When highly anis…
Experimental Bayesian calibration of trapped ion entangling operations
Lukas Gerster, Fernando Martínez-García, Pavel Hrmo +7
The performance of quantum gate operations is experimentally determined by how correct operational parameters can be determined and set, and how stable these parameters can be main…
Versatile fidelity estimation with confidence
Akshay Seshadri, Martin Ringbauer, Jacob Spainhour +3
As quantum devices become more complex and the requirements on these devices become more demanding, it is crucial to be able to verify the performance of such devices in a scalable…
Demonstration of fault-tolerant universal quantum gate operations
Lukas Postler, Sascha Heußen, Ivan Pogorelov +10
Quantum computers can be protected from noise by encoding the logical quantum information redundantly into multiple qubits using error correcting codes. When manipulating the logic…
Characterizing quantum instruments: from non-demolition measurements to quantum error correction
Roman Stricker, Davide Vodola, Alexander Erhard +7
In quantum information processing quantum operations are often processed alongside measurements which result in classical data. Due to the information gain of classical measurement…
A universal qudit quantum processor with trapped ions
Martin Ringbauer, Michael Meth, Lukas Postler +4
Today's quantum computers operate with a binary encoding that is the quantum analog of classical bits. Yet, the underlying quantum hardware consists of information carriers that ar…
Optimal metrology with programmable quantum sensors
Christian D. Marciniak, Thomas Feldker, Ivan Pogorelov +7
Quantum sensors are an established technology that has created new opportunities for precision sensing across the breadth of science. Using entanglement for quantum-enhancement wil…
Electric field noise in a high-temperature superconducting surface ion trap
Philip C. Holz, Kirill Lakhmanskiy, Dominic Rathje +3
Scaling up trapped-ion quantum computers requires new trap materials to be explored. Here, we present experiments with a surface ion trap made from the high-temperature superconduc…
Motion analysis of a trapped ion chain by single photon self-interference
G. Cerchiari, G. Araneda, L. Podhora +3
We present an optical scheme to detect the oscillations of a two-ion string confined in a linear Paul trap. The motion is detected by analyzing the intensity correlations in the fl…
Heating of a trapped ion induced by dielectric materials
Markus Teller, Dario A. Fioretto, Philip C. Holz +8
Electric-field noise due to surfaces disturbs the motion of nearby trapped ions, compromising the fidelity of gate operations that are the basis for quantum computing algorithms. W…
A compact ion-trap quantum computing demonstrator
Ivan Pogorelov, Thomas Feldker, Christian D. Marciniak +13
Quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry. Transitioning from lab-based, proof-o…
Relaxation times do not capture logical qubit dynamics
Amit Kumar Pal, Philipp Schindler, Alexander Erhard +5
Quantum error correction procedures have the potential to enable faithful operation of large-scale quantum computers. They protect information from environmental decoherence by sto…