Upcoming seminars

Quantum metrology with one-dimensional superradiant photonic states

Seminar date and time: 
2018-05-30 12:00
Author: 
Martí Perarnau Llobet
Affiliation: 
Max Planck Institute of Quantum Optics

Photonic states with large and fixed photon numbers, such as Fock states, enable quantum-enhanced metrology but remain an experimentally elusive resource. A potentially simple, deterministic and scalable way to generate these states consists of fully exciting N quantum emitters equally coupled to a common photonic reservoir, which leads to a collective decay known as Dicke superradiance.

Location: 
GIQ Seminar Room (C5/262)
Contact: 
marti.perarnau.llobet@gmail.com

Monogamy of correlations in the Bloch picture

Seminar date and time: 
2018-05-17 12:00
Author: 
Paul Appel
Affiliation: 
University of Vienna

We investigate monogamy of correlations in the Bloch representation. Here, monogamy of correlations can be understood as direct relations between different correlation tensor elements. 
To that end we introduce the split Bloch basis, that is particularly useful for representing quantum states with low dimensional support and thus amenable to purification arguments.

Location: 
GIQ Seminar Room
Contact: 
paul.jonas.appel@gmail.com

Gaussian quantum resource theories

Seminar date and time: 
2018-05-15 15:00
Author: 
Ludovico Lami
Affiliation: 
University of Nottingham

We develop a general framework characterizing the structure and properties of quantum resource theories for continuous-variable Gaussian states and Gaussian operations, establishing methods for their description and quantification. We show in particular that, under a few intuitive and physically-motivated assumptions on the set of free states, no Gaussian quantum resource can be distilled with Gaussian free operations, even when an unlimited supply of the resource state is available. This places fundamental constraints on state transformations in all such Gaussian resource theories.

Location: 
GIQ Seminar Room (C5/262)
Contact: 
ludovico.lami@gmail.com

Extendibility limits the performance of quantum processors

Seminar date and time: 
2018-05-15 12:00
Author: 
Eneet Kaur
Affiliation: 
Louisiana State university

Resource theories in quantum information science are helpful for the study and quantification of the performance of information-processing tasks that involve quantum systems. These resource theories also find applications in the study of other areas; e.g., the resource theories of entanglement and coherence have found use and implications in the study of quantum thermodynamics and memory effects in quantum dynamics.

Location: 
GIQ Seminar Room (C5/262)
Contact: 
eneet2311@gmail.com

Sampling mixed quantum states

Seminar date and time: 
2018-05-11 14:00
Author: 
Frederic Dupuis
Affiliation: 
Université de Lorraine

We investigate sampling procedures that certify that an arbitrary 
quantum state on $n$ subsystems is close to an ideal mixed state 
$\varphi^{\otimes n}$ for a given reference state $\varphi$, up to 
errors on a few positions. This task makes no sense classically: it 
would correspond to certifying that a given bitstring was generated 
according to some desired probability distribution. However, in the 
quantum case, this is possible if one has access to a prover who can 
supply a purification of the mixed state.

Location: 
GIQ Seminar Room (C5/262)
Contact: 
frederic.dupuis@loria.fr

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