49 citations · 151 across the 21 of their papers we have counts for
21 papers
MoMPy: automated construction of moment matrices for semidefinite programming relaxations
Carles Roch i Carceller
We present MoMPy, an open-source Python package that provides a unified, declarative construction of moment matrices for semidefinite programming (SDP) hierarchies. The user declar…
Characterising the set of deterministic quantum correlations in prepare-and-measure scenarios
Nicola D'Alessandro, Oliver Karlsson, Carles Roch i Carceller
Correlations that do not admit a deterministic explanation are a central feature of quantum theory and a key resource for quantum information processing. Identifying and certifying…
Efficient Energy-Constrained Semi-Device-Independent QRNG with an Integrated Heterodyne Receiver
Mattia Sabatini, Carles Roch i Carceller, Tommaso Bertapelle +10
Semi-device-independent QRNG frameworks represent a particularly attractive approach, combining strong security guarantees with high randomness generation rates while relying only…
A single programmable photonic circuit for universal quantum measurements
Wen-Zhe Yan, Lan-Tian Feng, Zhibo Hou +7
Programmable photonic quantum processors face a critical challenge: despite significant advances in quantum state preparation and manipulation, measurements remain limited to proje…
Semidefinite block-matrix relaxations for computing quantum correlations
Nicola D'Alessandro, Carles Roch i Carceller, Armin Tavakoli
Bounding the correlations predicted by quantum theory is an important challenge in quantum information science. Today's leading approach is semidefinite programming relaxations, bu…
The role of entanglement in energy-restricted communication and randomness generation
Carles Roch I Carceller, Armin Tavakoli
A promising platform for semi-device-independent quantum information is prepare-and-measure experiments restricted only by a bound on the energy of the communication. Here, we inve…
Sequential Semi-Device-Independent Quantum Randomness Certification
Carles Roch I Carceller, Hanwool Lee, Jonatan Bohr Brask +2
Quantum measurements under realistic conditions reveal only partial information about a system. Yet, by performing sequential measurements on the same system, additional informatio…
Entanglement Structure Certification Based on Energy-Restricted State Discrimination
Carles Roch I Carceller
The certification of entanglement in multipartite scenarios is crucial for the advancement of quantum technologies, particularly for the realization of large-scale quantum networks…
Unlimited quantum correlation advantage from bound entanglement
Armin Tavakoli, Carles Roch i Carceller, Lucas Tendick +1
Entangled states that cannot be distilled to maximal entanglement are called bound entangled and they are often viewed as too weak to break the limitations of classical models. Her…
Prepare-and-measure scenarios with photon-number constraints
Carles Roch i Carceller, Jef Pauwels, Stefano Pironio +1
We study correlations in the prepare-and-measure scenario when quantum communication is constrained by photon-number statistics. Such constraints are natural and practical control…
Global restrictions under local state discrimination
Carles Roch I Carceller, Alexander Bernal
We investigate how local distinguishability can restrict global properties of bi-partite states. We begin exploring how non-locality becomes limited by optimal local state discrimi…
Bound entangled states are useful in prepare-and-measure scenarios
Carles Roch I Carceller, Armin Tavakoli
We show that bipartite bound entangled states make possible violations of correlation inequalities in the prepare-and-measure scenario. These inequalities are satisfied by all clas…
Semidefinite relaxations for high-dimensional entanglement in the steering scenario
Nicola D'Alessandro, Carles Roch i Carceller, Armin Tavakoli
We introduce semidefinite programming hierarchies for benchmarking relevant entanglement properties in the high-dimensional steering scenario. Firstly, we provide a general method…
Improving semi-device-independent randomness certification by entropy accumulation
Carles Roch I Carceller, Lucas Nunes Faria, Zheng-Hao Liu +4
Certified randomness guaranteed to be unpredictable by adversaries is central to information security. The fundamental randomness inherent in quantum physics makes certification po…
Scalable entanglement certification via quantum communication
Pharnam Bakhshinezhad, Mohammad Mehboudi, Carles Roch i Carceller +1
Harnessing the advantages of shared entanglement for sending quantum messages often requires the implementation of complex two-particle entangled measurements. We investigate entan…
Contextuality witness inspired by optimal state discrimination
Carles Roch I Carceller, Jonatan Bohr Brask
Many protocols and tasks in quantum information science rely inherently on the fundamental notion of contextuality to provide advantages over their classical counterparts, and cont…
Quantum randomness certification with untrusted measurements and few probe states
Makoto Ishihara, Carles Roch i Carceller, Kieran Neil Wilkinson +3
We present a scheme for semi-device-independent quantum randomness certification from an untrusted measurement device and a trusted source and demonstrate it experimentally. No ass…
Maximum confidence measurement for qubit states
Hanwool Lee, Kieran Flatt, Carles Roch i Carceller +2
In quantum state discrimination, one aims to identify unknown states from a given ensemble by performing measurements. Different strategies such as minimum-error discrimination or…
Quantum vs. noncontextual semi-device-independent randomness certification
Carles Roch I Carceller, Kieran Flatt, Hanwool Lee +2
We compare the power of quantum and classical physics in terms of randomness certification from devices which are only partially characterised. We study randomness certification ba…
Contextual advantages and certification for maximum confidence discrimination
Kieran Flatt, Hanwool Lee, Carles Roch i Carceller +2
One of the most fundamental results in quantum information theory is that no measurement can perfectly discriminate between non-orthogonal quantum states. In this work, we investig…
Charge-Noise Insensitive Chiral Photonic Interface for Waveguide Circuit QED
Yu-Xiang Zhang, Carles R. i Carceller, Morten Kjaergaard +1
A chiral photonic interface is a quantum system that has different probabilities for emitting photons to the left and right. An on-chip compatible chiral interface is attractive fo…