Ivan Šupić
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View article: Quantum bounds for compiled XOR games and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>d</mml:mi> </mml:math> -outcome CHSH games
Quantum bounds for compiled XOR games and -outcome CHSH games Open
Nonlocal games play a crucial role in quantum information theory and have numerous applications in certification and cryptographic protocols. Kalai et al. (STOC 2023) introduced a procedure to compile a nonlocal game into a single-prover i…
View article: Quantitative quantum soundness for all multipartite compiled nonlocal games
Quantitative quantum soundness for all multipartite compiled nonlocal games Open
Compiled nonlocal games transfer the power of Bell-type multi-prover tests into a single-device setting by replacing spatial separation with cryptography. Concretely, the KLVY compiler (STOC'23) maps any multi-prover game to an interactive…
View article: Robustly self-testing all maximally entangled states in every finite dimension
Robustly self-testing all maximally entangled states in every finite dimension Open
We establish a device-independent, noise-tolerant certification of maximally entangled states in every finite dimension $d$. The core ingredient is a $d$-input, $d$-outcome Bell experiment that generalizes the Clauser-Horne-Shimony-Holt te…
View article: Experimentally Certified Transmission of a Quantum Message through an Untrusted and Lossy Quantum Channel via Bell’s Theorem
Experimentally Certified Transmission of a Quantum Message through an Untrusted and Lossy Quantum Channel via Bell’s Theorem Open
Quantum transmission links are central elements in essentially all protocols involving the exchange of quantum messages. Emerging progress in quantum technologies involving such links needs to be accompanied by appropriate certification to…
View article: Bounding the asymptotic quantum value of all multipartite compiled non-local games
Bounding the asymptotic quantum value of all multipartite compiled non-local games Open
Non-local games are a powerful tool to distinguish between correlations possible in classical and quantum worlds. Kalai et al. (STOC'23) proposed a compiler that converts multipartite non-local games into interactive protocols with a singl…
View article: Experimental Fiber-Based Quantum Triangle-Network Nonlocality with a Telecom <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mrow><mml:mi>Al</mml:mi><mml:mi>Ga</mml:mi><mml:mi>As</mml:mi></mml:mrow></mml:math> Multiplexed Entangled-Photon Source
Experimental Fiber-Based Quantum Triangle-Network Nonlocality with a Telecom Multiplexed Entangled-Photon Source Open
The exploration of the concept of nonlocality beyond standard Bell scenarios in quantum network architectures unveils fundamentally new forms of correlations that hold a strong potential for future applications of quantum communication net…
View article: All pure multipartite entangled states of qubits can be self-tested up to complex conjugation
All pure multipartite entangled states of qubits can be self-tested up to complex conjugation Open
Self-testing refers to the certification of quantum states and measurements based entirely on the correlations exhibited by measurements on separate subsystems. In the bipartite case, self-testing of states has been completely characterize…
View article: Network-Device-Independent Certification of Causal Nonseparability
Network-Device-Independent Certification of Causal Nonseparability Open
Causal nonseparability is the property underlying quantum processes incompatible with a definite causal order. So far it has remained a central open question as to whether any process with a clear physical realisation can violate a causal …
View article: Experimental quantum triangle network nonlocality with an AlGaAs multiplexed entangled photon source
Experimental quantum triangle network nonlocality with an AlGaAs multiplexed entangled photon source Open
The exploration of the concept of nonlocality beyond standard Bell scenarios in quantum network architectures unveils fundamentally new forms of correlations that hold a strong potential for future applications of quantum communication net…
View article: Experimental Sample-Efficient and Device-Independent GHZ State Certification
Experimental Sample-Efficient and Device-Independent GHZ State Certification Open
The certification of quantum resources is a critical tool in the development of quantum information processing. In particular, quantum state verification is a fundamental building block for communication and computation applications, deter…
View article: Qudit Clauser-Horne-Shimony-Holt Inequality and Nonlocality from Wigner Negativity
Qudit Clauser-Horne-Shimony-Holt Inequality and Nonlocality from Wigner Negativity Open
Nonlocality is an essential concept that distinguishes quantum from classical models and has been extensively studied in systems of qubits. For higher-dimensional systems, certain results for their two-level counterpart, like Bell violatio…
View article: Self-Testing Graph States Permitting Bounded Classical Communication
Self-Testing Graph States Permitting Bounded Classical Communication Open
Self-testing identifies quantum states and correlations that exhibit nonlocality, distinguishing them, up to local transformations, from other quantum states. Due to their strong nonlocality, it is known that all graph states can be self-t…
View article: Quantum bounds for compiled XOR games and $d$-outcome CHSH games
Quantum bounds for compiled XOR games and $d$-outcome CHSH games Open
Nonlocal games play a crucial role in quantum information theory and have numerous applications in certification and cryptographic protocols. Kalai et al. (STOC 2023) introduced a procedure to compile a nonlocal game into a single-prover i…
View article: Quantum nonlocality in the presence of strong measurement dependence
Quantum nonlocality in the presence of strong measurement dependence Open
It is well known that the effect of quantum nonlocality, as witnessed by\nviolation of a Bell inequality, can be observed even when relaxing the\nassumption of measurement independence, i.e. allowing for the source to be\npartially correla…
View article: Network-Device-Independent Certification of Causal Nonseparability
Network-Device-Independent Certification of Causal Nonseparability Open
Causal nonseparability is the property underlying quantum processes incompatible with a definite causal order. So far it has remained a central open question as to whether any process with a clear physical realisation can violate a causal …
View article: Experimentally Certified Transmission of a Quantum Message through an Untrusted and Lossy Quantum Channel via Bell's Theorem
Experimentally Certified Transmission of a Quantum Message through an Untrusted and Lossy Quantum Channel via Bell's Theorem Open
Quantum transmission links are central elements in essentially all protocols involving the exchange of quantum messages. Emerging progress in quantum technologies involving such links needs to be accompanied by appropriate certification to…
View article: Semi-Device-Independent Certification of Causal Nonseparability with Trusted Quantum Inputs
Semi-Device-Independent Certification of Causal Nonseparability with Trusted Quantum Inputs Open
While the standard formulation of quantum theory assumes a fixed background causal structure, one can relax this assumption within the so-called process matrix framework. Remarkably, some processes, termed causally nonseparable, are incomp…
View article: Self-testing nonlocality without entanglement
Self-testing nonlocality without entanglement Open
Quantum theory allows for nonlocality without entanglement. Notably, there exist bipartite quantum measurements consisting of only product eigenstates, yet they cannot be implemented via local quantum operations and classical communication…
View article: Genuine network quantum nonlocality and self-testing
Genuine network quantum nonlocality and self-testing Open
The network structure offers in principle the possibility for novel forms of quantum nonlocal correlations, that are proper to networks and cannot be traced back to standard quantum Bell nonlocality. Here we define a notion of genuine netw…
View article: Sample-Efficient Device-Independent Quantum State Verification and Certification
Sample-Efficient Device-Independent Quantum State Verification and Certification Open
Authentication of quantum sources is a crucial task in building reliable and\nefficient protocols for quantum-information processing. Steady progress\nvis-\\`{a}-vis verification of quantum devices in the scenario with fully\ncharacterized…
View article: Quantum networks self-test all entangled states
Quantum networks self-test all entangled states Open
Certifying quantum properties with minimal assumptions is a fundamental problem in quantum information science. Self-testing is a method to infer the underlying physics of a quantum experiment only from the measured statistics. While all b…
View article: Network Quantum Steering
Network Quantum Steering Open
The development of large-scale quantum networks promises to bring a multitude of technological applications as well as shed light on foundational topics, such as quantum nonlocality. It is particularly interesting to consider scenarios whe…
View article: Semi-Device-Independent Certification of Causal Nonseparability with Trusted Quantum Inputs
Semi-Device-Independent Certification of Causal Nonseparability with Trusted Quantum Inputs Open
While the standard formulation of quantum theory assumes a fixed background causal structure, one can relax this assumption within the so-called process matrix framework. Remarkably, some processes, termed causally nonseparable, are incomp…
View article: Experimental Robust Self-Testing of the State Generated by a Quantum Network
Experimental Robust Self-Testing of the State Generated by a Quantum Network Open
Self-testing is a method of quantum state and measurement estimation that\ndoes not rely on assumptions about the inner working of the used devices. Its\nexperimental realization has been limited to sources producing single quantum\nstates…
View article: Genuine network quantum nonlocality and self-testing
Genuine network quantum nonlocality and self-testing Open
The network structure offers in principle the possibility for novel forms of\nquantum nonlocal correlations, that are proper to networks and cannot be traced\nback to standard quantum Bell nonlocality. Here we define a notion of genuine\nn…
View article: Device-independent certification of tensor products of quantum states using single-copy self-testing protocols
Device-independent certification of tensor products of quantum states using single-copy self-testing protocols Open
Self-testing protocols are methods to determine the presence of shared entangled states in a device independent scenario, where no assumptions on the measurements involved in the protocol are made. A particular type of self-testing protoco…
View article: Device-Independent Certification of Genuinely Entangled Subspaces
Device-Independent Certification of Genuinely Entangled Subspaces Open
Self-testing is a procedure for characterizing quantum resources with the minimal level of trust. Up to now it has been used as a device-independent certification tool for particular quantum measurements, channels, and pure entangled state…
View article: Quantum Nonlocality in Networks Can Be Demonstrated with an Arbitrarily Small Level of Independence between the Sources
Quantum Nonlocality in Networks Can Be Demonstrated with an Arbitrarily Small Level of Independence between the Sources Open
Quantum nonlocality can be observed in networks even in the case where every party can only perform a single measurement, i.e., does not receive any input. So far, this effect has been demonstrated under the assumption that all sources in …
View article: Self-testing of quantum systems: a review
Self-testing of quantum systems: a review Open
Self-testing is a method to infer the underlying physics of a quantum experiment in a black box scenario. As such it represents the strongest form of certification for quantum systems. In recent years a considerable self-testing literature…