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High-Fidelity Remote Graph State Preparation for Blind Quantum Computation
Jiawei Cai, Rex Fleur, Benedikt Tissot +2
Measurement-based quantum computation (MBQC) relies on entangled graph states, yet existing remote state preparation (RSP) protocols prepare only separable states, requiring subseq…
Pulsed to continuous-wave quantum dot cavity-QED
Mio Poortvliet, Petr Steindl, Wolfgang Löffler
Resonant cavity-quantum system interactions are well understood in the pulsed coherent and continuous-wave steady-state limits, but not much in between. We investigate the intermed…
Towards experimental demonstration of quantum position verification using true single photons
Kirsten Kanneworff, Mio Poortvliet, Dirk Bouwmeester +6
The geographical position can be a good credential for authentication of a party, this is the basis of position-based cryptography - but classically this cannot be done securely wi…
Direct measurement of darkness using a standard single-photon avalanche photodiode
T. H. A. van der Reep, D. Molenaar, W. Löffler
In experiments requiring extreme darkness, such as experiments probing the limits of human vision, assessment of the background photon flux is essential. However, direct measuremen…
Quantum detector tomography applied to the human visual system: a feasibility study
T. H. A. van der Reep, D. Molenaar, W. Löffler +1
We show that quantum detector tomography can be applied to the human visual system to explore human perception of photon number states. In detector tomography, instead of using ver…
Artificial coherent states of light by multi-photon interference in a single-photon stream
P. Steindl, H. Snijders, G. Westra +9
Coherent optical states consist of a quantum superposition of different photon number (Fock) states, but because they do not form an orthogonal basis, no photon number states can b…
Phonon Interferometry for Measuring Quantum Decoherence
Matthew J. Weaver, David Newsom, Fernando Luna +2
Experimental observation of the decoherence of macroscopic objects is of fundamental importance to the study of quantum collapse models and the quantum to classical transition. Opt…
A fiber coupled cavity QED source of identical single photons
H. J. Snijders, J. A. Frey, J. Norman +6
A high-fidelity source of identical single photons is essential for numerous quantum technologies such as quantum repeaters and optical quantum information processing. Hallmarks th…
Purification of a single photon nonlinearity
H. Snijders, J. A. Frey, J. Norman +6
We show that the lifetime-reduced fidelity of a semiconductor quantum dot-cavity single photon nonlinearity can be restored by polarization pre- and postselection. This is realized…
Four-photon orbital angular momentum entanglement
B. C. Hiesmayr, M. J. A. de Dood, W. Löffler
Quantum entanglement shared between more than two particles is essential to foundational questions in quantum mechanics, and upcoming quantum information technologies. So far, up t…
Quantum dot nonlinearity through cavity-enhanced feedback with a charge memory
Morten P. Bakker, Thomas Ruytenberg, Wolfgang Loffler +4
In an oxide apertured quantum dot (QD) micropillar cavity-QED system, we found strong QD hysteresis effects and lineshape modifications even at very low intensities corresponding t…
Mutually Unbiased Bases and Bound Entanglement
Beatrix C. Hiesmayr, Wolfgang Löffler
In this contribution we relate two different key concepts: mutually unbiased bases (MUBs) and entanglement; in particular we focus on bound entanglement, i.e. highly mixed states w…
Complementarity Reveals Bound Entanglement of Two Twisted Photons
Beatrix C. Hiesmayr, Wolfgang Löffler
We witness for the first time the generation of bound entanglement of two photon qutrits, whose existence has been predicted by the Horodecki family in 1998. Detection of these hea…
Full-field quantum correlations of spatially entangled photons
V. D. Salakhutdinov, E. R. Eliel, W. Löffler
Spatially entangled twin photons allow the study of high-dimensional entanglement, and the Laguerre-Gauss modes are the most commonly used basis to discretize the single photon mod…
Fiber transport of spatially entangled photons
W. Löffler, T. G. Euser, E. R. Eliel +3
Entanglement in the spatial degrees of freedom of photons is an interesting resource for quantum information. For practical distribution of such entangled photons it is desireable…