Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Stefan Krastanov is active.

Publication


Featured researches published by Stefan Krastanov.


Physical Review Letters | 2015

Cavity State Manipulation Using Photon-Number Selective Phase Gates

Reinier Heeres; Brian Vlastakis; Eric Holland; Stefan Krastanov; Victor V. Albert; Luigi Frunzio; Liang Jiang; R. J. Schoelkopf

The large available Hilbert space and high coherence of cavity resonators make these systems an interesting resource for storing encoded quantum bits. To perform a quantum gate on this encoded information, however, complex nonlinear operations must be applied to the many levels of the oscillator simultaneously. In this work, we introduce the selective number-dependent arbitrary phase (snap) gate, which imparts a different phase to each Fock-state component using an off-resonantly coupled qubit. We show that the snap gate allows control over the quantum phases by correcting the unwanted phase evolution due to the Kerr effect. Furthermore, by combining the snap gate with oscillator displacements, we create a one-photon Fock state with high fidelity. Using just these two controls, one can construct arbitrary unitary operations, offering a scalable route to performing logical manipulations on oscillator-encoded qubits.


Bulletin of the American Physical Society | 2015

Universal control of an oscillator with dispersive coupling to a qubit

Stefan Krastanov; Victor V. Albert; Chao Shen; Chang-Ling Zou; Reinier Heeres; Brian Vlastakis; R. J. Schoelkopf; Liang Jiang

We investigate quantum control of an oscillator mode off-resonantly coupled to an ancillary qubit. In the strong dispersive regime, we may drive the qubit conditioned on the number states of the oscillator, which, together with displacement operations, can achieve universal control of the oscillator. Based on our proof of universal control, we provide a straightforward recipe to perform arbitrary unitary operations on the oscillator. With the capability of universal control, we can significantly reduce the number of operations to prepare the number state


Scientific Reports | 2017

Deep Neural Network Probabilistic Decoder for Stabilizer Codes

Stefan Krastanov; Liang Jiang

\left|n\right\ensuremath{\rangle}


Physical Review B | 2017

Quantum channel construction with circuit quantum electrodynamics

Chao Shen; Kyungjoo Noh; Victor V. Albert; Stefan Krastanov; Michel H. Devoret; R. J. Schoelkopf; S. M. Girvin; Liang Jiang

from


Physical Review Letters | 2016

Holonomic Quantum Control with Continuous Variable Systems

Victor V. Albert; Chi Shu; Stefan Krastanov; Chao Shen; Ren-Bao Liu; Zhen-Biao Yang; R. J. Schoelkopf; Mazyar Mirrahimi; Michel H. Devoret; Liang Jiang

O\left(n\right)


arXiv: Quantum Physics | 2015

Holonomic quantum computing with cat-codes

Victor V. Albert; Stefan Krastanov; Chao Shen; Ren-Bao Liu; R. J. Schoelkopf; Mazyar Mirrahimi; Michel H. Devoret; Liang Jiang

to


Archive | 2016

Techiniques of oscillator control for quantum information processing and related systems and methods

Reinier Heeres; Brian Vlastakis; Victor V. Albert; Stefan Krastanov; Liang Jiang; Iii Robert J. Schoelkopf

O\left(\sqrt{n}\right)


Bulletin of the American Physical Society | 2018

Generation and Decoding of Random Sparse Stabilizer Codes

Stefan Krastanov; Liang Jiang

. This universal control scheme of the oscillator enables us to efficiently manipulate the quantum information stored in the oscillator, which can be implemented using superconducting circuits.


arXiv: Quantum Physics | 2017

Optimized Entanglement Purification

Stefan Krastanov; Victor V. Albert; Liang Jiang

Neural networks can efficiently encode the probability distribution of errors in an error correcting code. Moreover, these distributions can be conditioned on the syndromes of the corresponding errors. This paves a path forward for a decoder that employs a neural network to calculate the conditional distribution, then sample from the distribution - the sample will be the predicted error for the given syndrome. We present an implementation of such an algorithm that can be applied to any stabilizer code. Testing it on the toric code, it has higher threshold than a number of known decoders thanks to naturally finding the most probable error and accounting for correlations between errors.


Bulletin of the American Physical Society | 2017

Applications of a Circuit QED Quantum Channel Constructor

Chao Shen; Kyungjoo Noh; Victor V. Albert; Stefan Krastanov; Michel H. Devoret; R. J. Schoelkopf; S. M. Girvin; Liang Jiang

Quantum channels can describe all transformations allowed by quantum mechanics. We provide an explicit universal protocol to construct all possible quantum channels, using a single qubit ancilla with quantum non-demolition readout and adaptive control. Our construction is efficient in both physical resources and circuit depth, and can be demonstrated using superconducting circuits and various other physical platforms. There are many applications of quantum channel construction, including system stabilization and quantum error correction, Markovian and exotic channel simulation, implementation of generalized quantum measurements and more general quantum instruments. Efficient construction of arbitrary quantum channels opens up exciting new possibilities for quantum control, quantum sensing and information processing tasks.

Collaboration


Dive into the Stefan Krastanov's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Ren-Bao Liu

The Chinese University of Hong Kong

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Eric Holland

Lawrence Livermore National Laboratory

View shared research outputs
Researchain Logo
Decentralizing Knowledge