Publications (15)
Orthogonalization of partly unknown quantum states
M. Jezek, M. Micuda, I. Straka +3
A quantum analog of the fundamental classical NOT gate is a quantum gate that would transform any input qubit state onto an orthogonal state. Intriguingly, this universal NOT gate…
Suppression of ferromagnetism in van der Waals insulator due to pressure-induced layer stacking variation
M. Misek, U. Dutta, P. Kral +15
Ferromagnetism in van der Waals insulators like CrBr3 is highly sensitive to structural modifications. We explore the pressure-driven structural and magnetic transformations of the…
Structural Phase Transitions in SrRh2As2
V. Zinth, V. Petricek, M. Dusek +1
SrRh2As2 exhibits structural phase transitions reminiscent to those of BaFe2As2, but crystallizes with three polymorphs derived from the tetragonal ThCr2Si2-type structure. The str…
Process fidelity estimation of linear optical quantum CZ gate: A comparative study
M. Micuda, M. Sedlak, I. Straka +4
We present a systematic comparison of different methods of fidelity estimation of a linear optical quantum controlled-Z gate implemented by two-photon interference on a partially p…
Optimal entanglement-assisted discrimination of quantum measurements
M. Mikova, M. Sedlak, I. Straka +5
We investigate optimal discrimination between two projective single-qubit measurements in a scenario where the measurement can be performed only once. We consider general setting i…
Experimental realization of linear-optical partial SWAP gates
A. Cernoch, J. Soubusta, L. Bartuskova +2
We present a linear-optical implementation of a class of two-qubit partial SWAP gates for polarization states of photons. Different gate operations, including the SWAP and entangli…
Several experimental realizations of symmetric phase-covariant quantum cloner of single-photon qubits
J. Soubusta, L. Bartuskova, A. Cernoch +2
We compare several optical implementations of phase-covariant cloning machines. The experiments are based on copying of the polarization state of a single photon in bulk optics by…
Magnetic phase diagram of the antiferromagnet U2Rh2Pb
J. Pospisil, M. Misek, M. Divis +4
A new U-based compound of the U2Rh2Pb, a new compound of the U2T2X series was prepared in a single-crystal form. Its structure was determined as belonging to the tetragonal Mo2FeB2…
Testing operational phase concepts in quantum optics
J. Rehacek, Z. Hradil, M. Dusek +2
An experimental comparison of several operational phase concepts is presented. In particular, it is shown that statistically motivated evaluation of experimental data may lead to a…
Experimental phase-covariant cloning of polarization states of single photons
A. Cernoch, L. Bartuskova, J. Soubusta +3
The experimental realization of optimal symmetric phase-covariant 1->2 cloning of qubit states is presented. The qubits are represented by polarization states of photons generated…
Antiferrodistortive phase transition in EuTiO3
V. Goian, S. Kamba, O. Pacherova +14
X-ray diffraction, dynamical mechanical analysis and infrared reflectivity studies revealed an antiferrodistortive phase transition in EuTiO3 ceramics. Near 300K the perovskite str…
How quantum correlations enhance prediction of complementary measurements
R. Filip, M. Gavenda, J. Soubusta +2
If there are correlations between two qubits then the results of the measurement on one of them can help to predict measurement results on the other one. It is an interesting quest…
Analogy between optimal spin estimation and interferometry
Z. Hradil, M. Dusek
Scheme for optimal spin state estimation is considered in analogy with phase detection in interferometry. Recently reported coherent measurements yielding the average fidelity (N+1…
Programmable discriminator of coherent states - experimental realization
L. Bartuskova, A. Cernoch, J. Soubusta +1
The optical implementation of the recently proposed unambiguous identification of coherent states is presented. Our system works as a programmable discriminator between two, in gen…
Quantum controlled-Z gate for weakly interacting qubits
M. Micuda, R. Starek, I. Straka +5
We propose and experimentally demonstrate a scheme for implementation of a maximally entangling quantum controlled-Z gate between two weakly interacting systems. We conditionally e…