Speaker: Steve Girvin This talk will present an overview of systems comprised of both qubits and oscillators. Such hybrid platforms offer powerful architectures with novel gates and instruction sets for quantum computation and hardware-efficient quantum error correction now going beyond the break-even point. In addition, recent experiments on quantum simulations of physical models containing boson

https://www.nano.lu.se/abstract-quantum-computation-error-correction-and-simulation-superconducting-qubits-and-bosonic - 2025-07-13

Speaker: John Martinis In order to specify a quantum computer technology, it is important to describe not just the qubit type and architecture, but qubit errors.  This is because qubits are fundamentally error-prone, and computational power can only occur if the errors are small enough, roughly 2%.  I will describe how the quantum supremacy experiment from Google was able to measure system error r

https://www.nano.lu.se/abstract-system-testing-quantum-computer - 2025-07-13

Speaker: Chris Monroe Trapped atomic ions are a leading physical platform for quantum computers, featuring qubits with essentially infinite idle coherence times and the highest purity quantum gate operations. Such atomic clock qubits are controlled with laser beams, allowing densely-connected and reconfigurable universal gate sets. The path to scale involves concrete architectural paths based on w

https://www.nano.lu.se/abstract-quantum-computing-atoms - 2025-07-13

Speaker: Matthias Steffen How do we deal with errors in quantum mechanics? We trade resources measured in the form of complexity, number of qubits, and runtime for reduced impact of errors. Quantum Error Correction (QEC) generally trades number of qubits and runtime along with classical processing (syndrome matching) to reduce effective errors rates. Owing to the significant overhead associated wi

https://www.nano.lu.se/abstract-error-mitigation-error-correction-continuous-path - 2025-07-13

Speaker: John Preskill I will review an experimentally feasible procedure for converting a quantum state into a succinct classical description of the state, its classical shadow. Classical shadows can be applied to predict efficiently many properties of interest, including expectation values of local observables and few-body correlation functions. Efficient classical machine learning algorithms us

https://www.nano.lu.se/abstract-making-predictions-quantum-world-overview-talk - 2025-07-13

Speaker: David DiVincenzo Our work looks at the transmon array as a many body (boson lattice) system, asking what attributes of the many body phase influence the usability of this array for gate-based quantum computing. Many body localization is desirable. Ref: Christoph Berke, Evangelos Varvelis, Simon Trebst, Alex Altland, and David P. DiVincenzo, “Transmon platform for quantum computing challen

https://www.nano.lu.se/abstract-transmon-platform-quantum-computing-challenged-chaotic-fluctuations - 2025-07-13

Speaker: Ignacio Cirac In this talk I will review some of the connections between these two research areas. In particular, on how local dynamics in many body systems can be described in terms of quantum circuits and cellular automata, as well as tensor networks.

https://www.nano.lu.se/abstract-quantum-information-theory-and-many-body-physics - 2025-07-13

Speaker: Qi-Kun Xue The quantum Hall effect (QHE), a quantized version of the Hall effect [1], was observed in two-dimensional (2D) electron systems under magnetic field more than 40 years ago [2, 3]. The quantum anomalous Hall (QAH) effect refers to a quantized version of the anomalous Hall effect [4], which doesn’t require an external magnetic field. It had been predicted to occur in “2D graphit

https://www.nano.lu.se/abstract-topological-insulators-quantum-anomalous-hall-effect - 2025-07-13

Speaker: Anton Zeilinger Early experiments on quantum foundations were motivated essentially by curiosity. There was no awareness that this opened up the avenue to quantum information. The experiments I will discuss go from neutron interferometry via three-photon entanglement, and entanglement swapping  to recent path identity results based on a seminal and long overlooked paper by Wang, Zou, and

https://www.nano.lu.se/abstract-curiosity-about-quantum-foundations-roots-quantum-technology - 2025-07-13

Speaker: Yoshihisa Yamamoto In this talk we will review the recent progress in coherent Ising machines (CIM). The CIM is an optical parametric oscillator (OPO) network based special purpose computer for Ising model and related optimization problems. The Ising cost function is mapped to the OPO network loss landscape by dissipative coupling rather than the energy landscape by Hamiltonian coupling,

https://www.nano.lu.se/abstract-single-photon-coherent-ising-machine - 2025-07-13

Speaker: Atac Imamoglu Twisted bilayers of two dimensional semiconductors have emerged as a new paradigm for exploration of strongly correlated electron systems. In this talk, I will describe experiments revealing signatures of kinetic magnetism in hole-doped Mott state of electrons in a triangular lattice.

https://www.nano.lu.se/abstract-strongly-correlated-electrons-atomically-thin-semiconductors - 2025-07-13

Speaker: Mikhail Lukin A broad effort is currently under way to build quantum machines that may be capable of outperforming the existing classical counterparts in executing useful tasks in areas ranging from computation and communication to sensing and metrology. Practical realization of such systems and exploration of their potential capabilities and limitations are among the central challenges i

https://www.nano.lu.se/abstract-programmable-quantum-systems-simulations-sensing-and-computing-overview-talk - 2025-07-13

Speaker: Jun Ye Precise control of quantum states of matter, including engineered interactions and correlations between quantum particles, is revolutionizing the performance of atomic clocks and metrology. The confluence of quantum science and precision measurement provides opportunities to explore emerging phenomena and test fundamental physics.  Recent advances include a measurement of the gravi

https://www.nano.lu.se/abstract-clock-based-quantum-matter - 2025-07-13

Speaker: Paola Cappellaro Quantum sensors exploit the strong sensitivity of quantum systems to external disturbances to measure various signals in their environment with high precision. Nitrogen Vacancy color centers in diamond have in particular emerged as exquisite probes of magnetic fields. These quantum sensors have the potential to be a revolutionary tool in material science, quantum informat

https://www.nano.lu.se/abstract-practical-quantum-advantage-sensing - 2025-07-13

Speaker: Michel Devoret The accuracy of logical operations on quantum bits (qubits) must be improved for quantum computers to surpass classical ones in useful tasks. To that effect, quantum information needs to be made robust to noise that affects the underlying physical system. Rather than suppressing noise, quantum error correction aims at preventing it from causing logical errors. This approach

https://www.nano.lu.se/abstract-error-correction-logical-qubit - 2025-07-13

Speaker: Peter Zoller Quantum simulation aims at `solving´ complex quantum many-body problems efficiently and with controlled errors on quantum devices. Here we discuss quantum simulation from the perspective of programmable analog quantum simulators, as realized in present cold atom and ion experiments, where the unique features are scalability to large particle numbers and programmability. The f

https://www.nano.lu.se/abstract-programmable-quantum-simulators-atoms-and-ions-overview-talk - 2025-07-13

Speaker: Immanuel Bloch 40 years ago, Richard Feynman outlined his vision of a quantum simulator for carrying out complex calculations of physical problems. Today, his dream has become a reality and a highly active field of resarch across different platforms ranging from ultracold atoms and ions, to superconducting qubits and photons. In my talk, I will outline how ultracold atoms in optical latti

https://www.nano.lu.se/abstract-large-scale-quantum-simulations-using-ultracold-atoms-optical-lattices - 2025-07-13

Speaker: Rainer Blatt The state-of-the-art of the Innsbruck trapped-ion quantum computer [1] is briefly reviewed. We present an overview on the available quantum toolbox and discuss the scalability of the approach. With up to 50 fully controlled ion qubits we perform quantum simulations investigating quantum transport [2] and emerging hydrodynamics features [3]. Employing the quantum toolbox for e

https://www.nano.lu.se/abstract-quantum-computation-and-quantum-simulation-trapped-ca-ions - 2025-07-13

Speaker: Krysta Svore While quantum computation has long been promised, and new scenarios and problems for it to tackle are being explored, at the moment we are short on scale. To define and understand the requirements of scale requires also knowing the needs of the problems to be solved.  And then, together with those requirements, working to define the desiderata of the system architecture.  I’l

https://www.nano.lu.se/abstract-quantum-scale - 2025-07-13

Speaker: Jukka Pekola I will describe experiments on superconducting quantum circuits combined with an ultrasensitive calorimeter. The heart of the calorimeter is a thermometer capable of measuring local temperature down to microsecond time scales. Experiments on quantum limited heat transport, heat valves and refrigerators based on superconducting qubits will be presented. A detector with noise d

https://www.nano.lu.se/abstract-quantum-thermodynamics-experiments-superconducting-circuits - 2025-07-13