Currently, I am working on various topics ranging from mathematical and geometrical aspects such as mutually unbiased bases and symmetric informationally complete measurements to practical applications like quantum imaging.

Dr. Ali Asadian

 Personal Page

Research Interest

 

  • Entanglement detection
  • Quantum Contextuality
  • Non-classicality tests of quantum mechanics, e.g. Bell and Leggett-Garg tests
  • Mutually unbiased bases, SIC-POVM, General Bloch representation
  • Quantum transport in networks and biological complexes
  • Quantum imaging
  • Linear optical quantum networks
  • Quantum sequential measurements and joint measurability and quantum uncertainties
  • Phase-space representations and continuous variable quantum systems
  • Ontology of the Wavefunction

Researches and Teaching

Teaching

Enhanced entanglement criterion via symmetric informationally complete measurements

We show that a special type of measurements, called symmetric informationally complete positive operator-valued measures (SIC POVMs), provide a stronger entanglement detection criterion than the computable cross-norm or realignment criterion based on local orthogonal observables. As an illustration, we demonstrate the enhanced entanglement detection power in simple systems of qubit and qutrit pairs. This observation highlights the signi cance of SIC POVMs for entanglement detection.

 

DOI: 10.1103/PhysRevA.98.022309

Classicalization of Quantum State of Detector by Amplification Process

 

It has been shown that a macroscopic system being in a high-temperature thermal coherent state can be, in principle, driven into a non-classical state by coupling to a microscopic system. Therefore, thermal coherent states do not truly represent the classical limit of quantum  description. Here, we study the classical limit of quantum state of a more relevant macroscopic system, namely the pointer of a detector, after the phase-preserving linear amplification process. In particular, we examine to what extent it is possible to find the corresponding amplified state in a superposition state, by coupling the pointer to a qubit system. We demonstrate quantitatively that the amplification process is able to produce the classical limit of quantum state of the pointer, offering a route for a classical state in a sense of not to be projected into a quantum superposition state.

 

DOI: 10.1016/j.physleta.2019.02.039

Heisenberg-Weyl Observables: Bloch vectors in phase space

 

We introduce a Hermitian generalization of Pauli matrices to higher dimensions which is based on Heisenberg-Weyl operators. The complete set of Heisenberg-Weyl observables allows us to identify a real-valued Bloch vector for an arbitrary density operator in discrete phase space, with a smooth transition to in nite dimensions. Furthermore, we derive bounds on the sum of expectation values of any set of anti-commuting observables. Such bounds can be used in entanglement detection and we show that Heisenberg-Weyl observables provide a  rst non-trivial example beyond the dichotomic case.

 

DOI: 10.1103/PhysRevA.94.010301

 

Seminar Talks

  • Testing macroscopic realism and contextuality in continuous variable system  (PDF File)
    Centre for Quantum Information & Communication (QuIC), Universite libre de Bruxelles (Oct, 2017)
  • From quantum non-locality to entanglement; analysis in a uni ed ontological framework  (PDF File)
    IPM, Foundation of physics group, Tehran (Feb, 2017)
  • Road map to quantum foundations today: From reality of quantum state to Qbist interpretation  (PDF File)
    IPM, Tehran (Dec, 2015)

    More Seminar Talks

Conference Talks

  • Quasi-probability representation and quantum joint measurements  (PDF File)
    FQXi Workshop: Quantum Incompatibility, Maria Laach (Monday, 28/08/17 to Friday, 01/09/17)
  • Heisenberg-Weyl observables: Bloch vector in phase space  (PDF File)
  • Fundamental tests via Ramsey correlation measurements in hybrid systems  (PDF File)
    Workshop on \Temporal Correlations and Steering", Siegen, October 2016.

    More Conference Talks

Dr. Ali Asadian

Assistant professor

 

Room No. 018,

Physics Department,

Institute for Advanced Studies in Basic Sciences (IASBS)

444 Prof. Yousef Sobouti Blvd.,

Zanjan 45137-66731, Iran

 

Ali.Asadian[at]iasbs.ac.ir     |     Ali.Asadian668[at]gmail.com

 

+98 24 3315 2 018  [Office]

 

 

 

Last Update: January 25, 2020

measurements