Error message

Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in _menu_load_objects() (line 579 of /home/equsorg/public_sqd/includes/menu.inc).

Anatoly Kulikov

Anatoly has completed his thesis on "In situ quantum control over superconducting qubits" and joined Quantum Device Lab at ETH Zürich 

Anatoly have graduated from Saint-Petersburg State University, Russia, in 2015. His research work was concerned with theoretical physics, with both bachelor's diploma and master's thesis being dedicated to applications of quantum field theory to statistical physics. Particularly, he worked with models of developed turbulence with spontaneously violated parity. Having some additional programming experience and being interested in less abstract fields of physics, Anatoly joined SQD lab for three months (November 2015 - February 2016) as a visiting academic to undertake research training in superconducting quantum circuits.
He came back to SQD Lab as a PhD student in July 2016 to continue his research work on superconducting quantum circuits.

2021

Neural networks for on-the-fly single-shot state classification
Navarathna Rohit et al, 2021
Applied Physics Letters

Neural networks have proven to be efficient for a number of practical applications ranging from image recognition to identifying phase transitions in quantum physics models.

2020

Measuring effective temperatures of qubits using correlations
Kulikov A, Navarathna R and Fedorov A, 2020
Phys. Rev. Lett., 124, pp. 240501

Initialization of a qubit in a pure state is a prerequisite for quantum computer operation. Qubits are commonly initialized by cooling to their ground states through passive thermalization or by using active reset protocols.

2019

In situ characterization of qubit control lines: a qubit as a vector network analyzer
Jerger M. et al, 2019
Phys. Rev. Lett., 123, pp. 150501

We present a technique to measure the transfer function of a control line using a qubit as a vector network analyzer. Our method requires coupling the line under test to the the longitudinal component of the Hamiltonian of the qubit and the ability to induce Rabi oscillations through simultaneous driving of the transversal component. We used this technique to characterize the 'flux' control of a superconducting Transmon qubit in the range of 8 to 400\,MHz. Our method can be used for the qubit 'flux' line calibration to increase the fidelity of entangling gates for the quantum processor. The qubit can be also used as a microscopic probe of the electro-magnetic fields on a chip. 

2017

Realization of a quantum random generator certified with the Kochen-Specker theorem
Kulikov A. et al, 2017
Physical Review Letters, 119, pp. 240501

We experimentally realize a quantum random number generator (QRNG) with randomness of each generated number certified by the Kochen-Specker theorem. Employing this novel certification scheme eliminates the necessity for input seed random numbers and lifts the non-locality requirement for the certified QRNG. Implementation on the base of superconducting qubits allows achieving a bit rate of 25 kBit/s, two orders of magnitude higher than previously reported certified QRNGs. These improvements make our result a major step towards realization a practical certified quantum QRNG with implications for digital security and modelling algorithms.