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Journal articleSimsek S, Mintert F, 2021,
Quantum control with a multi-dimensional Gaussian quantum invariant
, Quantum, Vol: 5, Pages: 1-12, ISSN: 2521-327XThe framework of quantum invariants is an elegant generalization of adiabatic quantum control to control fields that do not need to change slowly. Due to the unavailability of invariants for systems with more than one spatial dimension, the benefits of this framework have not yet been exploited in multi-dimensional systems. We construct a multi-dimensional Gaussian quantum invariant that permits the design of time-dependent potentials that let the ground state of an initial potential evolve towards the ground state of a final potential. The scope of this framework is demonstrated with the task of shuttling an ion around a corner which is a paradigmatic control problem in achieving scalability of trapped ion quantum information technology.
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Journal articleLie SH, Kwon H, Kim MS, et al., 2021,
Quantum one-time tables for unconditionally secure qubit- commitment
, Quantum, Vol: 5, Pages: 1-17, ISSN: 2521-327XThe commodity-based cryptography is an alternative approach to realize conventionally impossible cryptographic primitives such as unconditionally secure bit-commitment by consuming pre-established correlation between distrustful participants. A unit of such classical correlation is known as the one-time table (OTT). In this paper, we introduce a new example besides quantum key distribution in which quantum correlation is useful for cryptography. We propose a scheme for unconditionally secure qubit-commitment, a quantum cryptographic primitive forbidden by the recently proven no-masking theorem in the standard model, based on the consumption of the quantum generalization of the OTT, the bipartite quantum state we named quantum one-time tables (QOTT). The construction of the QOTT is based on the newly analyzed internal structure of quantum masker and the quantum secret sharing schemes. Our qubit-commitment scheme is shown to be universally composable. We propose to measure the randomness cost of preparing a (Q)OTT in terms of its entropy, and show that the QOTT with superdense coding can increase the security level with half the cost of OTTs for unconditionally secure bit-commitment. The QOTT exemplifies an operational setting where neither maximally classically correlated state nor maximally entangled state, but rather a well-structured partially entangled mixed state is more valuable resource.
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Journal articleGorpincenko A, French G, Knight P, et al., 2021,
Improving Automated Sonar Video Analysis to Notify About Jellyfish Blooms
, IEEE SENSORS JOURNAL, Vol: 21, Pages: 4981-4988, ISSN: 1530-437X -
Journal articleNeveu P, Clarke J, Vanner MR, et al., 2021,
Preparation and verification of two-mode mechanical entanglement through pulsed optomechanical measurements
, NEW JOURNAL OF PHYSICS, Vol: 23, ISSN: 1367-2630- Cite
- Citations: 11
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Journal articleZhao H, Mintert F, Moessner R, et al., 2021,
Random Multipolar Driving: Tunably Slow Heating through Spectral Engineering
, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007- Cite
- Citations: 47
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Journal articleAustin D, Johnson A, McGrath F, et al., 2021,
Extracting sub-cycle electronic and nuclear dynamics from high harmonic spectra
, Scientific Reports, Vol: 11, ISSN: 2045-2322We present a new methodology for measuring few-femtosecond electronic and nuclear dynamics in both atoms and polyatomic molecules using multidimensional high harmonic generation (HHG) spectroscopy measurements, in which the spectra are recorded as a function of the laser intensity to form a two-dimensional data set. The method is applied to xenon atoms and to benzene molecules, the latter exhibiting significant fast nuclear dynamics following ionization. We uncover the signature of the sub-cycle evolution of the returning electron flux in strong-field ionized xenon atoms, implicit in the strong field approximation but not previously observed directly. We furthermore extract the nuclear autocorrelation function in strong field ionized benzene cations, which is determined to have a decay of τ0=4±1 fs, in good agreement with the τ0=3.5 fs obtained from direct dynamics variational multi-configuration Gaussian calculations. Our method requires minimal assumptions about the system, and is applicable even to un-aligned polyatomic molecules.
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Journal articleDevlin JA, Borchert MJ, Erlewein S, et al., 2021,
Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap
, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007- Cite
- Citations: 40
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Journal articleEnzian G, Price JJ, Freisem L, et al., 2021,
Single-Phonon Addition and Subtraction to a Mechanical Thermal State
, PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007- Cite
- Citations: 35
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Journal articleDoppelbauer M, Walter N, Hofsass S, et al., 2021,
Characterisation of the <i>b</i><SUP>3</SUP>Σ<SUP>+</SUP>, <i>v</i>=0 state and its interaction with the <i>A</i><SUP>1</SUP>Π state in aluminium monofluoride
, MOLECULAR PHYSICS, Vol: 119, ISSN: 0026-8976 -
Journal articleJarlaud V, Hrmo P, Joshi MK, et al., 2021,
Coherence properties of highly-excited motional states of a trapped ion
, Journal of Physics B: Atomic, Molecular and Optical Physics, Vol: 54, Pages: 1-12, ISSN: 0953-4075We present a study of the coherence properties of a variety of motional states of a single ion confined in a Penning ion trap. We demonstrate that the motion of the ion has a coherence time of the order of 1 s, using Ramsey interferometry. We introduce a technique for preparing the ion in an incoherent superposition of highly-excited motional states using a simple modification of optical sideband cooling. Coherent manipulation of these states allows measurements of optical and motional coherence to be carried out. We show that these highly-excited motional state superpositions have long coherence times despite the incoherent preparation of the states. Such states can be useful for sensitive motional dephasing measurements.
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Journal articleAbel C, Ayres NJ, Ban G, et al., 2021,
A search for neutron to mirror-neutron oscillations using the nEDM apparatus at PSI
, PHYSICS LETTERS B, Vol: 812, ISSN: 0370-2693 -
Conference paperSvela A, Silver JM, Del Bino L, et al., 2021,
>30 dB suppression of intrinsic backscattering in whispering-gallery-mode microresonators
We demonstrate a technique for suppressing backscattered light in a whispering-gallery-mode resonator by positioning a sub-wavelength-size scatterer within its evanescent field, achieving at least 34 dB suppression compared to the intrinsic backscattering.
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Journal articleFitch NJ, Lim J, Hinds EA, et al., 2021,
Methods for measuring the electron's electric dipole moment using ultracold YbF molecules
, QUANTUM SCIENCE AND TECHNOLOGY, Vol: 6, ISSN: 2058-9565 -
Conference paperSempere-Llagostera S, Thekkadath GS, Patel RB, et al., 2021,
Reducing g(2)(0) of a Parametric Down-Conversion Source via Photon-Number Resolution with Superconducting Nanowire Detectors
We demonstrate a 13±0.4% reduction of the second-order correlation function g<sup>(</sup>2<sup>)</sup>(0) by harnessing the photon-number resolving capabilities of commercial superconducting nanowire single-photon detectors, improving the quality of a heralded single-photon source.
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Conference paperEnzian G, Freisem L, Price JJ, et al., 2021,
Single- and Multi-Phonon Subtraction to a Mechanical Thermal State via Optomechanics
We perform single- and multi-phonon subtraction to a mechanical thermal state in a Brillouin optomechanical system. An increase in the mean mechanical occupation and non-Gaussianity in the s-parameterised Wigner phase-space distribution is observed.
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Journal articleKim MS, 2021,
A massive test
, NATURE PHYSICS, Vol: 17, Pages: 14-15, ISSN: 1745-2473 -
Conference paperEnzian G, Price JJ, Freisem L, et al., 2021,
Brillouin optomechanics in whispering-gallery-mode microresonators: From strong coupling to single-phonon addition and subtraction
, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020 -
Conference paperGarratt D, Misiekis L, Wood D, et al., 2021,
Ultrafast Exciton Dynamics in Poly(3-hexylthiophene) Probed with Time Resolved X-ray Absorption Spectroscopy at the Carbon K- edge
, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE -
Conference paperSvela AO, Silver JM, Del Bino L, et al., 2021,
More Than 34 dB Backscattering Suppression in Microresonators
, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE -
Conference paperMoroney N, del Bino L, Woodley MTM, et al., 2021,
Spontaneous polarization symmetry breaking of light in a microresonator
, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE -
Conference paperSvela AO, Silver JM, Del Bino L, et al., 2021,
>30 dB Suppression of Intrinsic Backscattering in Whispering-Gallery-Mode Microresonators
, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020 -
Conference paperAlexander O, Barillot T, Cooper B, et al., 2021,
Inner Valence Hole Migration in Isopropanol
, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE -
Journal articleSvela AO, Silver JM, Del Bino L, et al., 2020,
Coherent suppression of backscattering in optical microresonators
, LIGHT-SCIENCE & APPLICATIONS, Vol: 9, ISSN: 2095-5545- Cite
- Citations: 40
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Journal articleSauvage F, Mintert F, 2020,
Optimal Quantum Control with Poor Statistics
, PRX QUANTUM, Vol: 1- Cite
- Citations: 13
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Journal articleZhang W-H, Liu X, Yin P, et al., 2020,
Classical communication enhanced quantum state verification
, NPJ QUANTUM INFORMATION, Vol: 6- Cite
- Citations: 13
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Journal articleMartinetz L, Hornberger K, Millen J, et al., 2020,
Quantum electromechanics with levitated nanoparticles
, npj Quantum Information, Vol: 6, ISSN: 2056-6387Preparing and observing quantum states of nanoscale particles is a challenging task with great relevance for quantum technologies and tests of fundamental physics. In contrast to atomic systems with discrete transitions, nanoparticles exhibit a practically continuous absorption spectrum and thus their quantum dynamics cannot be easily manipulated. Here, we demonstrate that charged nanoscale dielectrics can be artificially endowed with a discrete level structure by coherently interfacing their rotational and translational motion with a superconducting qubit. We propose a pulsed scheme for the generation and read-out of motional quantum superpositions and entanglement between several levitated nanoparticles, providing an all-electric platform for networked hybrid quantum devices.
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Journal articleYu S, Meng Y, Tang J-S, et al., 2020,
Experimental Investigation of Quantum <i>PT</i>-Enhanced Sensor
, PHYSICAL REVIEW LETTERS, Vol: 125, ISSN: 0031-9007- Cite
- Citations: 76
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Journal articlePaige AJ, Kwon H, Simsek S, et al., 2020,
Quantum delocalized interactions
, Physical Review Letters, Vol: 125, Pages: 240406 – 1-240406 – 6, ISSN: 0031-9007Classical mechanics obeys the intuitive logic that a physical event happens at a definite spatial point. Entanglement, however, breaks this logic by enabling interactions without a specific location. In this work we study these delocalized interactions. These are quantum interactions that create less locational information than would be possible classically, as captured by the disturbance induced on some spatial superposition state. We introduce quantum games to capture the effect and demonstrate a direct operational use for quantum concurrence in that it bounds the nonclassical performance gain. We also find a connection with quantum teleportation, and demonstrate the games using an IBM quantum processor.
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Journal articleDrahi D, Walk N, Hoban MJ, et al., 2020,
Certified Quantum Random Numbers from Untrusted Light
, PHYSICAL REVIEW X, Vol: 10, ISSN: 2160-3308- Cite
- Citations: 46
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Journal articleEnzian G, Price J, Freisem L, et al., 2020,
Single-phonon addition and subtraction to a mechanical thermal state
, Physical Review Letters, ISSN: 0031-9007
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