Rainer Blatt
Institute for Quantum Optics and Quantum Information
Ion trapOpticsQuantum entanglementPhysicsIonPhotonQuantum simulatorQuantum informationTrapped ion quantum computerAtomic physicsMaterials scienceQubitLaserQuantum computerQuantum mechanicsQuantum opticsGround stateCavity quantum electrodynamicsQuantumLaser cooling
467Publications
95H-index
26.1kCitations
Publications 430
Newest
#1Roman StrickerH-Index: 6
#2Davide VodolaH-Index: 12
Last. Thomas MonzH-Index: 30
view all 10 authors...
In quantum information processing quantum operations are often processed alongside measurements which result in classical data. Due to the information gain of classical measurement outputs non-unitary dynamical processes can take place on the system, for which common quantum channel descriptions fail to describe the time evolution. Quantum measurements are correctly treated by means of so-called quantum instruments capturing both classical outputs and post-measurement quantum states. Here we pre...
#1Martin RingbauerH-Index: 15
#2Michael MethH-Index: 7
Last. Thomas MonzH-Index: 30
view all 7 authors...
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 are not necessarily binary, but typically exhibit a rich multilevel structure, which is artificially restricted to two dimensions. A wide range of applications from quantum chemistry to quantum simulation, on the other hand, would benefit from access to higher-dimensional Hilbert spaces, which conventional quantum comput...
#1C. Greganti (University of Vienna)H-Index: 6
#2Tommaso F. Demarie (SUTD: Singapore University of Technology and Design)H-Index: 9
Last. Lukas Postler (University of Innsbruck)H-Index: 9
view all 16 authors...
Source
#1Philip C. HolzH-Index: 7
#2Kirill LakhmanskiyH-Index: 7
Last. Rainer BlattH-Index: 95
view all 6 authors...
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 superconductor YBCO, a promising material for future trap designs. We show that voltage noise from superconducting electrode leads is negligible within the sensitivity S_V=9\times 10^{-20}\,\mathrm{V}^2\mathrm{Hz}^{-1}of our setup, and for lead dimensions typical for advanced trap designs. Furthermore, we investigate the frequ...
Source
#1Giovanni CerchiariH-Index: 13
#2Gabriel AranedaH-Index: 5
Last. Rainer BlattH-Index: 95
view all 6 authors...
We demonstrate an optical method for detecting the mechanical oscillations of an atom with single-phonon sensitivity. The measurement signal results from the interference between the light scattered by a single trapped atomic ion and that of its mirror image. The motion of the atom modulates the interference path length and hence the photon detection rate. We detect the oscillations of the atom in the Doppler cooling limit and reconstruct average trajectories in phase space. We demonstrate singl...
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#2T. FeldkerH-Index: 7
Last. Thomas Monz (University of Innsbruck)H-Index: 30
view all 10 authors...
Cold atoms and ions exhibit unparalleled performance in frequency metrology epitomized in the atomic clock. More recently, such atomic systems have been used to implement programmable quantum computers and simulators with highest reported operational fidelities across platforms. Their strength in metrology and quantum information processing offers the opportunity to utilize tailored, programmable entanglement generation to approach the `optimal quantum sensor' compatible with quantum mechanics. ...
#1M. K. JoshiH-Index: 14
#2F. KranzlH-Index: 1
Last. C. RoosH-Index: 12
view all 8 authors...
Identifying universal properties of non-equilibrium quantum states is a major challenge in modern physics. A fascinating prediction is that classical hydrodynamics emerges universally in the evolution of any interacting quantum system. Here, we experimentally probe the quantum dynamics of 51 individually controlled ions, realizing a long-range interacting spin chain. By measuring space-time resolved correlation functions in an infinite temperature state, we observe a whole family of hydrodynamic...
#1Roman Stricker (University of Innsbruck)H-Index: 6
#2Davide Vodola (Swansea University)H-Index: 12
Last. Rainer Blatt (University of Innsbruck)H-Index: 95
view all 10 authors...
Source
#1Dmitry S. Bykov (University of Innsbruck)H-Index: 5
#2Lorenzo Dania (University of Innsbruck)H-Index: 3
Last. Tracy E. Northup (University of Innsbruck)H-Index: 19
view all 6 authors...
Source
#1Chiara Greganti (University of Vienna)H-Index: 8
#2Tommaso F. Demarie (NUS: National University of Singapore)H-Index: 9
Last. Lukas Postler (University of Innsbruck)H-Index: 9
view all 16 authors...
Quantum computers are on the brink of surpassing the capabilities of even the most powerful classical computers. This naturally raises the question of how one can trust the results of a quantum computer when they cannot be compared to classical simulation. Here we present a verification technique that exploits the principles of measurement-based quantum computation to link quantum circuits of different input size, depth, and structure. Our approach enables consistency checks of quantum computati...
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