The Quantum Paper Club is organized by students for students. Its goal is to expose the students interested in Quantum Engineering to the research done in the field. More than this, it is a formidable platform to practice public scientific speaking.
The Quantum Paper Club usually takes place on Thursdays at 17:45 in HIT H42. If you would like to present, please contact Jan (jobermeier@student.ethz.ch) or Eric (egoldhahn@student.ethz.ch).
The Quantum Paper Club has concluded for the current semester. We will be back again next semester.
Past Talks
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Single-Photons, Entangled Photon Pairs & Optimal Quantum Cloning of Qubits
25.05.2023Nicolas Gisin
Quantum physics has many applications today, many techniques have been developed and are now used in various fields. However, going back to the foundations, there are many interesting and still unresolved questions. This week, Nicolas Gisin will talk about the single photon, how to define it and how far it can travel if you want…
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Atomistic DFT Simulation of Scaled 3nm FinFET & 22nm FDSOI CMOS Quantum Dot Devices
17.05.2023Vivek Dhande
Current production FinFET and FDSOI CMOS technologies are suitable for large-scale, high-density quantum processor (QP) and readout control electronics. Due to layout manufacturability restrictions, that limit the types of qubit arrays and gates that can be implemented, the top gate pitch is too large for strong tunnel coupling between adjacent quantum dots (QDs), limiting the…
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A Quantum Information View on Black Holes
11.05.2023Giulia Mazzola
A major discovery by Hawking was that the interplay between general relativity and quantum theory leads to the prediction that black holes must radiate. In Hawking’s original calculation however, the black hole radiation was found to be of thermal character, thus leaving behind a mixed state describing the radiation as soon as the black hole…
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Schrödinger Cat States in a 16-microgram Mechanical Oscillator
04.05.2023Marius Bild
While the principle of superposition in quantum physics is routinely validated for microscopic systems, it is still unclear why we do not observe macroscopic objects to be in superpositions of states that can be distinguished by some classical property. I will present our experiments, that harness the resonant Jaynes-Cummings interaction between a high overtone resonator…
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Motional Squeezing for Trapped Ion Transport and Separation
27.04.2023Dario Scheiwiller
One of the (many) challenges in scalable quantum computing with trapped ions is the transport of the ions. The transport of the ions needs to be done while avoiding the arch-enemy of ion-trappers: motional heating. In my talk we’ll discuss a recent paper by Sutherland et al. that explores a new protocol of ion transport,…
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From Machine Learning to Computational Quantum Physics
06.04.2023Filippo Vicentini
Machine-learning techniques that originated in several domains of “Artificial Intelligence”, are increasingly being applied to tackle problems in physical sciences. Applications range from experimental fields, where ML has been leveraged to more efficiently carry out measurements, inhibit noise or design structures, to computational and theoretical physics. In particular, a recent breakthrough showed that several numerical…
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Quantum Control of Trapped Ions with Integrated Photonics
30.03.2023Alfredo Ricci Vásquez
Scaling up trapped ion quantum information processors requires high fidelity control over many ions. One way of achieving such control is by using a trap with multiple zones, each zone holding few ions which can be manipulated with high fidelity. Operations between the ions are achieved by means of transporting the ions across zones. Although…
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Realizing Quantum Convolutional Neural Networks on a Superconducting Quantum Processor to Recognize Quantum Phases
23.03.2023Johannes Herrmann
Quantum computing crucially relies on the ability to efficiently characterize the quantum states output by quantum hardware. Conventional methods which probe these states through direct measurements and classically computed correlations become computationally expensive when increasing the system size. Quantum neural networks tailored to recognize specific features of quantum states by combining unitary operations, measurements and…
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An Intuitive Approach to Analogue Gravity in Bose-Einstein Condensates
16.03.2023Sébastien Garmier
An analogue gravity model is a physical system in flat spacetime with wave propagation behaving like the propagation of a scalar field of mass m in some curved spacetime. In the first part, we review analogue gravity models with wave propagation governed by a Lagrangian. In this context we propose a novel and more pedagogical…
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Quantum Knitting for Dummies
09.03.2023James O’Sullivan
Multidimensional tensor-network states, such as cluster states, are a key resource for quantum communication and measurement-based quantum computing. Recently, cluster states have been generated both in the microwave and optical regime but the generation of large-scale 2D cluster states in discrete-variable systems remains challenging. We present a superconducting device to enable the generation of two-dimensional…
| Meeting date | Topic | Presenter | Abstract | Link to reference |
|---|---|---|---|---|
| 26.04.2022 | The impact of quantum mechanics on philosophy | Lev Vaidman (Professor @ Tel Aviv University) | The uncertainty principle and Bell-type correlations led to a dramatic change in the philosophy of science. Today we are ready to accept indeterminism and some kind of action at a distance. I will argue that this move is not necessary and maybe mistaken. Accepting the existence of multiple parallel worlds allows restoring determinism and avoiding action at a distance. The issue of probability in the many-worlds framework, however, requires introducing a novel element in science. Warning: I plan to split the world during the talk! | |
| 19.04.2022 | Dynamic generation of entangled electrons in a Cooper pair splitter | Fredrik Brange (PostDoc @ Aalto University) | Cooper pair splitters are promising candidates for generating spin-entangled electrons. However, the splitting of Cooper pairs is a random and noisy process, which hinders further synchronized operations on the entangled electrons. To circumvent this problem, we propose and analyze a dynamic Cooper pair splitter that produces a noiseless and regular flow of spin-entangled electrons. The Cooper pair splitter is based on a superconductor coupled to quantum dots, whose energy levels are tuned in and out of resonance to control the splitting process. We identify the optimal operating conditions for which exactly one Cooper pair is split per period of the external drive and the flow of entangled electrons becomes noiseless. To characterize the regularity of the Cooper pair splitter in the time domain, we analyze the g(2) function of the output currents and the distribution of waiting times between split Cooper pairs. Our proposal is feasible using current technology, and it paves the way for dynamic quantum information processing with spin-entangled electrons. | Link |
| 12.04.2022 | Introduction to dissipation engineering | Elias Zapusek (PhD @ ETH TIQI) | Dissipation arises in quantum systems due to interaction with environment. In unitary quantum information processing dissipation is primarily considered as a source of noise. However, we can also use controlled dissipation to manipulate quantum systems. Starting from the most well-known example optical pumping and moving on to more complex schemes I will give a brief introduction to the field of dissipation engineering. | Link |
| 05.04.2022 | Saving the cat: From open quantum systems to bosonic quantum error correction | David Schlegel (PhD @ EPFL) | A popular approach for realizing a fault-tolerant quantum computer is to construct logical qubits encoded in multiple physical two-level qubits. Recent alternative approaches are based on bosonic quantum codes which are quantum error correcting (QEC) codes that redundantly encode quantum information in the states of a quantum harmonic oscillator, making it possible to detect and correct errors, while reducing the hardware resource overhead. In this talk, I will provide an overview of QEC in bosonic systems and review various bosonic quantum codes such as GKP and cat codes. Furthermore, I will show recent results on a novel bosonic quantum code, called the squeezed cat code, that enables to correct both dephasing and loss errors. We show that with moderate squeezing, and using typical parameters of state-of-the-art quantum hardware platforms, the squeezed cat code has a resilience to loss errors and dephasing errors that significantly outperform that of the conventional cat code. | Link |
| 29.03.2022 | Hardware-Tailored Diagonalization Circuits | Daniel Miller (PhD @ IBM) | A central building block of many quantum algorithms is the diagonalization of Pauli operators. Although it is always possible to construct a quantum circuit that simultaneously diagonalizes a given set of commuting Pauli operators, only resource-efficient circuits are reliably executable on near-term quantum computers. Generic diagonalization circuits can lead to an unaffordable Swap-gate overhead on quantum devices with limited hardware connectivity. A common alternative is excluding two-qubit gates, however, this comes at the cost of restricting the class of diagonalizable sets of Pauli operators to tensor product bases (TPBs). In this letter, we introduce a theoretical framework for constructing hardware-tailored (HT) diagonalization circuits. We apply our framework to group the Pauli operators occurring in the decomposition of a given Hamiltonian into jointly-HT-diagonalizable sets. We investigate several classes of popular Hamiltonians and observe that our approach requires a smaller number of measurements than conventional TPB approaches. Finally, we experimentally demonstrate the practical applicability of our technique, which showcases the great potential of our circuits for near-term quantum computing. | Link |
| 22.03.2022 | Photon-Pair generation from single LiNbO3 microcubes and GaAs nanowires | Saerens Grégoire (PhD @ ETH) | Nonclassical light sources are highly sought after as they are an integral part of quantum communication and quantum computation devices. Typical sources rely on bulk crystals that are not compact and have limited bandwidth due to phase-matching conditions. Here I will present generation of photon pairs at the telecommunication wavelength from free-standing LiNbO 3 microcubes and free-standing GaAs cut Nanowires using the spontaneous parametric down- conversion process. I will show the fabrication process for each of this nanostructure, the setup configuration for free space spontaneous parametric down-conversion, as well as the alignment challenges when trying to observe this wavelength conversion process in transmission. We will compare experimental as well as simulation results for both nanostructures. | Link |
| 15.03.2022 | No session – Pauli Lectures | |||
| 08.03.2022 | Quantum Memories in a Quantum Network | Moritz Businger (PhD @ UNIGE) | Quantum memories are one of the corner stones in a quantum network. It enables communication beyond the loss limit of direct communication and lets us use more complex protocols for quantum computation. Here I will present the ensemble based quantum memory approach we are perusing in Geneva and show how this lets us store a record number of quantum states in a rare earth ion doped crystal. Especially our recent work on Ytterbium is very competitive in terms of capacity and storage time which makes it a perfect candidate implementation in a largescale quantum network. | |
| 01.03.2022 | Blueprint for a Scalable Photonic Fault-Tolerant Quantum Computer | Ilan Tzitrin and Eli Bourassa (Xanadu) | Link | |
| 14.12.2021 | Realizing Repeated Quantum Error Correction in a Distance-Three Surface Code | Nathan Lacroix (PhD @ Qudev, ETH) | Link | |
| 07.11.2021 | Joint measurability of binary qubit measurements | Dmitry Grinko (PhD @ U. o. Amsterdam) | ||
| 30.11.2021 | An addressable quantum dot qubit with fault-tolerant control-fidelity | Markus Niese | Link | |
| 23.11.2021 | Universal quantum computation with ideal Clifford gates and noisy ancillas | Ivan Rojkov (PhD @ TIQI, ETH) | Link | |
| 16.11.2021 | Frequency-domain Hong-Ou-Mandel interference | Dario Scheiwiller | Link | |
| 09.11.2021 | Strong Optomechanical Coupling at Room Temperature | Dr. Nadine Meyer (Senior Scientist @ NSL, ETH) | — | |
| 02.11.2021 | Measurement of Subpicosecond Time Intervals between Two Photons by Interference | Moritz Fontboté Schmidt | Link | |
| 26.10.2021 | Test of the Local Realism and Realism in Particle Physics | Anna Efimova | Link | |
| 21.10.2021 | Stabilization and operation of a Kerr-cat qubit in a nonlinear superconducting resonator | Dr. Alexander Grimm (PSI) | Link | |
| 14.10.2021 | Error correction with real-time Feedback for Surface 17 on the Zurich Instruments setup | Liberto Beltrán | ||
07.10.2021 | Demonstrating the power of state-of-the-art quantum computers | Elisa Bäumer (PhD @ Renner/ETH+IBM) | ||
01.07.2021 | Bulk crystalline optomechanics | Elisa Bäumer (PhD @ Renner/ETH+IBM) | Link | |
24.06.2021 | Constructing quantum codes from any classical code and their embedding in ground space of local Hamiltonians | Dina Abdelhadi, (PhD @ EPFL) | Link | |
17.06.2021 | Controlling the competition between coherent and dissipative processes in a superradiant quantum gas. | Francesco Ferri (Postdoc @ Esslinger/ETH) | Link | |
10.06.21 | Strawberry Fields: A Software Platform for Photonic Quantum Computing | Ivan Rojkov/Moritz Fontboté Schmidt | Link | |
| 03.06.2021 | A gate-tunable, field-compatible fluxonium | Marta Pita Vidal (TU Delft) | Link | |
| 27.05.2021 | Qiskit Pulse: Programming Quantum Computers Through the Cloud with Pulses | Caroline Tornow | Link | |
| 20.05.2021 | Quantum Architecture Search via Deep Reinforcement Learning | Kristina Kirova | Link | |
| 13.05.2021 | Generation of Nonclassical Motional States of a Trapped Atom | Moritz Fontboté Schmidt | Link | |
| 06.05.2021 | Quantum acoustics with superconducting qubits | Alessandro Bruno | Link | |
| 29.04.2021 | Chiral Quantum Optics | Chaoxin Ding | Link | |
| 15.04.2021 | Quantum error correction of a qubit encoded in grid states of an oscillator | Alec Eickbusch (PhD student at Prof. Devoret’s Qulab at Yale University) | Link | |
| 01.04.2021 | A four-qubit germanium quantum processor | Ivan Rojkov | Link | |
| 25.03.2021 | Predicting many properties of a quantum system from very few measurements | Ivan Rojkov | Link | |
| 18.03.2021 | A network-ready random-access qubits memory | Stefano Marti | Link | |
| 11.03.2021 | How to put quantum particles on magic bullet trajectories that can hit two targets without a clear line-of-sight | Ivan Rojkov | Link | |
| 02.03.2021 | SpinQ Gemini: a desktop quantum computer for education and research | Moritz Fontboté Schmidt | Link | |
| 23.02.2021 | Strongly correlated Fermions strongly coupled to light | Prof. Jean-Philippe Brantut (EPFL) | Laboratory for Quantum Gases | |
| 08.12.2020 | Error correction of a logical grid state qubit by dissipative pumping | Ivan Rojkov & Moritz Fontboté Schmidt | Link | |
| 1.12.2020 | Observation of coherent optical information storage in anatomic medium using halted light pulses | Moritz Fontboté Schmidt | Link | |
| 24.11.2020 | Quantum memories for photons | Dr. Mikael Afzelius | Quantum Repeaters & Memories | |
| 17.11.2020 | Measurement of subpicosecond time intervals between two photons by interference | Moritz Fontboté Schmidt | Link | |
| 10.11.2020 | Quantum-dot spin–photon entanglement via frequency downconversion to telecom wavelength | Marco Stucki | Link | |
| 03.11.2020 | Observation of entanglement between a quantum dot spin and a single photon | Chaoxin Ding | Link | |
| 27.10.2020 | An introduction to Pound–Drever–Hall laser frequency stabilization | Moritz Fontbote Schmidt & Benjamin van Ommen | Link | |
| 20.10.2020 | Cavity Quantum Electrodynamics at Arbitrary Light-Matter Coupling Strengths | Alperen Tügen | Link | |
| 13.10.2020 | Architecture for a large-scale ion-trapquantum computer | Ivan Rojkov | Link | |
| 06.10.2020 | Interaction-assisted reversal of thermopower with ultracold atoms | Moritz Fontbote Schmidt | Link | |
| 29.09.2020 | Charge Insensitive Qubit Design derived from the Cooper Pair Box | Moritz Fontbote Schmidt | Link | |
| 22.09.2020 | Hartree-Fock on a superconducting qubit quantum computer | Ivan Rojkov | Link | |
| 21.07.2020 | Generation of entangled photon states in optical down-conversion and up-conversion processes. | Sahnawaz Alam (MSc in Physics at Indian Institute of Technology Gandhinagar) | ||
| 07.07.2020 | From nanotech to living sensors:unraveling the spin physics of biosensing at the nanoscale | Prof. Clarice D. Aiello (Assistant professor at UCLA and head of the Quantum Biology Tech (QuBiT) Lab ) | ||
| 30.06.2020 | Direct Measurement of the Density Matrix of a Quantum System | Alperen Tügen | Paper | |
| 23.06.2020 | Proof-of-concept proposal for machine learning using superconducting qubits (Master Thesis) | Colin Scarato | Contact speaker | |
| 16.06.2020 | Normal-Mode Splitting in a Weakly Coupled Optomechanical System | Francesco Adinolfi | Paper | |
| 09.06.2020 | Optimal cooling of a spin-boson system | Emanuel Malvetti (Semester thesis) | Contact speaker | |
| 02.06.2020 | Direct measurement of the Zak phase in topological Bloch bands | Benjamin van Ommen | Paper | |
| 26.05.2020 | Ramsey interferometry with dissipative quantum error correction | Ivan Rojkov (Semester thesis) | Contact speaker | |
| 19.05.2020 | Cavity-Based 3D Cooling of a Levitated Nanoparticle via Coherent Scattering | Dominik Windey (Phd Student in the Novotny/Photonics group) | Paper, PDF of presentation | |
| 12.05.2020 | Integrated optical multi-ion quantum logic | Chi Zhang (PhD student in the Home/TIQIgroup) | Paper | |
| 05.05.2020 | Topological Quantum Computing | Oriel Kiss | Lecture notes by Preskill | |
| 28.04.2020 | Remote quantum entanglement between two micromechanical oscillators | Marco Stucki | Paper | |
| 21.04.2020 | Non-classical correlations between single photons and phonons from a mechanical oscillator | Chaoxin Ding | Paper | |
| 15.04.2020 | Reinforcement Learning in Different Phases of Quantum Control | Pedro Rosso | Paper | |
| 08.04.2020 | Cavity-Assisted Quantum Bath Engineering | Moritz Fontboté Schmidt | Paper | |
| 1.04.2020 | Error-mitigated quantum gates exceeding physical fidelities in a trapped-ion system | Moritz Fontboté Schmidt | Paper | |
| (Corona-break) | ||||
| 10.03.2020 | To catch and reverse a quantum jump mid flight | Alperen Tugen | Paper | |
| 02.03.2020 | Entanglement of two quantum memories via fibres over dozens of kilometres | Moritz Fontboté Schmidt | Paper | |
| 25.02.2020 | Atom-by-atom assembly of defect-free one-dimensional cold atom arrays | Yongxin Song | Paper | |
| 18.02.2020 | Fast two-qubit logic with holes in Germanium | Moritz Fontboté Schmidt | Paper | |
| 17.12.19 | How often should you beat your kids? | Moritz Fontboté Schmidt | Paper | |
| 10.12.2019 | Single-Shot Quantum Nondemolition Detection of Individual Itinerant Microwave Photons | Moritz Fontboté Schmidt | Paper | |
| 03.12.2019 | Universal Gate for Fixed-Frequency Qubits via a Tunable Bus | Moritz Fontboté Schmidt | Paper | |
| 26.11.2019 | Ultracold and unreactive fermionic molucules and A degenerate Fermi gas of polar Molecules | Marit Fiechter | Paper and Paper | |
| 19.11.2019 | Measurement of subpicosecond time intervals between two photons by interference | Moritz Fontboté Schmidt | Paper | |
| 12.11.2019 | Towards fault-tolerant quantum computing with trapped ions | Moritz Fontboté Schmidt | Paper | |
| 05.11.2019 | Quantum Computations with Cold Trapped Ions | Moritz Fontboté Schmidt | Paper | |
| 29.10.2019 | Nanoscale imaging magnetometry with diamond spins under ambient conditions | Alperen Tügen, Moritz Fontboté Schmidt | Paper | |
| 22.10.2019 | Charge Insensitive qubit design derived from the cooper pair box | Benjamin Van Ommen, Alperen Tugen, Moritz Fontboté Schmidt | Paper |
If not noted otherwise, presenters were ETH students.