22 citations · 135 across the 31 of their papers we have counts for
9 papers · 1 filter
A universal scheme to self-test any quantum state or measurement
Shubhayan Sarkar, Alexandre C. Orthey, Remigiusz Augusiak
The emergence of quantum devices has raised a significant issue: how to certify the quantum properties of a device without placing trust in it. To characterise quantum states and m…
Shared randomness allows violation of macroscopic realism using a single measurement
Shubhayan Sarkar
Macro-realistic description of systems is based majorly on two basic intuitions about the classical world, namely, macrorealism per se, that is, the system is always in a distinct…
Operationally independent events can influence each other in quantum theory
Shubhayan Sarkar
In any known description of nature, two physical systems are considered independent of each other if any action on one of the systems does not change the other system. From our cla…
Distrustful quantum steering
Shubhayan Sarkar
Quantum steering is an asymmetric form of quantum nonlocality where one can trust the measurements of one of the parties. In this work, inspired by practical considerations we inve…
Certification of randomness without seed randomness
Shubhayan Sarkar
The security of any cryptographic scheme relies on access to random number generators. Device-independently certified random number generators provide maximum security as one can d…
Network quantum steering enables randomness certification without seed randomness
Shubhayan Sarkar
Quantum networks with multiple sources allow the observation of quantum nonlocality without inputs. Consequently, the incompatibility of measurements is not a necessity for observi…
Certification of unbounded randomness with arbitrary noise
Shubhayan Sarkar
Random number generators play an essential role in cryptography and key distribution. It is thus important to verify whether the random numbers generated from these devices are gen…
Certification of entangled quantum states and quantum measurements in Hilbert spaces of arbitrary dimension
Shubhayan Sarkar
The emergence of quantum theory at the beginning of 20 century has changed our view of the microscopic world and has led to applications such as quantum teleportation, quantum…
Self-testing composite measurements and bound entangled state in a single quantum network
Shubhayan Sarkar, Chandan Datta, Saronath Halder +1
Within the quantum networks scenario we introduce a single scheme allowing to certify three different types of composite projective measurements acting on a three-qubit Hilbert spa…