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Cryptographic quantum metrology

Author(s): Zixin Huang, Chiara Macchiavello, and Lorenzo Maccone
We develop a general framework for parameter estimation that allows only trusted parties to access the result and achieves optimal precision. The protocols are designed such that adversaries can access some information indeterministically, but only at the risk of getting caught (cheat sensitivity); ...
[Phys. Rev. A 99, 022314] Published Wed Feb 13, 2019

Wed, 13/02/2019 - 11:00

Device-Independent Detection of Genuine Multipartite Entanglement for All Pure States

Author(s): M. Zwerger, W. Dür, J.-D. Bancal, and P. Sekatski
We show that genuine multipartite entanglement of all multipartite pure states in arbitrary finite dimension can be detected in a device-independent way by employing bipartite Bell inequalities on states that are deterministically generated from the initial state via local operations. This leads to ...
[Phys. Rev. Lett. 122, 060502] Published Tue Feb 12, 2019

Tue, 12/02/2019 - 11:00

Proof of efficient, parallelized, universal adiabatic quantum computation

Author(s): Ari Mizel
We give a careful proof that a parallelized version of adiabatic quantum computation can efficiently simulate universal gate model quantum computation. The proof specifies an explicit parameter-dependent Hamiltonian $H(λ)$ that is based on ground state quantum computation [Mizel et al., Phys. Rev. ...
[Phys. Rev. A 99, 022311] Published Tue Feb 12, 2019

Tue, 12/02/2019 - 11:00

Overcomplete quantum tomography of a path-entangled two-photon state

Author(s): L. De Santis, G. Coppola, C. Antón, N. Somaschi, C. Gómez, A. Lemaître, I. Sagnes, L. Lanco, J. C. Loredo, O. Krebs, and P. Senellart
Path-entangled $N$-photon states are key resources for quantum enhanced metrology and quantum imaging, as well as quantum computation. However, the quantum tomography of path-entangled indistinguishable photons is still in its infancy. We propose and implement a quantum tomographical method to chara...
[Phys. Rev. A 99, 022312] Published Tue Feb 12, 2019

Tue, 12/02/2019 - 11:00

Performance of quantum error correction with coherent errors

Author(s): Eric Huang, Andrew C. Doherty, and Steven Flammia
We compare the performance of quantum error correcting codes when memory errors are unitary with the more familiar case of dephasing noise. For a wide range of codes, we analytically compute the effective logical channel that results when the error correction steps are performed noiselessly. Our exa...
[Phys. Rev. A 99, 022313] Published Tue Feb 12, 2019

Tue, 12/02/2019 - 11:00

Entanglement negativity of fermions: Monotonicity, separability criterion, and classification of few-mode states

Author(s): Hassan Shapourian and Shinsei Ryu
We study quantum information aspects of the fermionic entanglement negativity recently introduced [H. Shapourian et al., Phys. Rev. B 95, 165101 (2017)] based on the fermionic partial transpose. In particular, we show that it is an entanglement monotone under the action of local quantum operations ...
[Phys. Rev. A 99, 022310] Published Mon Feb 11, 2019

Mon, 11/02/2019 - 11:00

Experimental Realization of a Quantum Autoencoder: The Compression of Qutrits via Machine Learning

Author(s): Alex Pepper, Nora Tischler, and Geoff J. Pryde
Classical machine learning is used to experimentally compress quantum information in a photonic system.
[Phys. Rev. Lett. 122, 060501] Published Mon Feb 11, 2019

Mon, 11/02/2019 - 11:00

Quantum trajectories for a system interacting with environment in N -photon state

We derive stochastic master equation for a quantum system interacting with an environment prepared
in a continuous-mode N -photon state. To determine the conditional evolution of the quantum system
depending on continuous in time measurements of the output field the model of repeated interactions
and measurements is applied. The environment is defined as an infinite chain of harmonic oscillators
which do not interact between themselves and they are prepared initially in an entangled state being

Mon, 11/02/2019 - 01:00

Nonlinearly bandlimited signals

In this paper, we study the inverse scattering problem for a class of signals that have a compactly
supported reflection coefficient. The problem boils down to the solution of the
Gelfand–Levitan–Marchenko (GLM) integral equations with a kernel that is bandlimited. By adopting a
sampling theory approach to the associated Hankel operators in the Bernstein spaces, a constructive
proof of existence of a solution of the GLM equations is obtained under various restrictions on the

Mon, 11/02/2019 - 01:00

Finite-size corrections for the attractive mean-field monomer-dimer model

The finite volume correction for a mean-field monomer-dimer system with an attractive interaction
are computed for the pressure density, the monomer density and the susceptibility. The results are
obtained by introducing a two-dimensional integral representation for the partition function
decoupling both the hard-core interaction and the attractive one. The next-to-leading terms for each
of the mentioned quantities are explicitly derived as well as the value of their sign that is

Mon, 11/02/2019 - 01:00