Avoiding environmental losses in quantum information systems

Date:
September 28, 2020
Source:
Springer
Summary:
New research has revealed how robust initial states can be prepared
in quantum information systems, minimizing any unwanted transitions
which lead to losses in quantum information.



FULL STORY ==========================================================================
New research published in EPJ D has revealed how robust initial states
can be prepared in quantum information systems, minimising any unwanted transitions which lead to losses in quantum information.


========================================================================== Through new techniques for generating 'exceptional points' in quantum information systems, researchers have minimised the transitions through
which they lose information to their surrounding environments.

Recently, researchers have begun to exploit the effects of quantum
mechanics to process information in some fascinating new ways. One of
the main challenges faced by these efforts is that systems can easily
lose their quantum information as they interact with particles in their surrounding environments.

To understand this behaviour, researchers in the past have used
advanced models to observe how systems can spontaneously evolve into
different states over time -- losing their quantum information in
the process. Through new research published in EPJ D, M. Reboiro and
colleagues at the University of La Plata in Argentina have discovered
how robust initial states can be prepared in quantum information systems, avoiding any unwanted transitions extensive time periods.

The team's findings could provide valuable insights for the rapidly
advancing field of quantum computing; potentially enabling more complex operations to be carried out using the cutting-edge devices. Their
study considered a 'hybrid' quantum information system based around
a specialised loop of superconducting metal, which interacted with an
ensemble of imperfections within the atomic lattice of diamond. Within
this system, the researchers aimed to generate sets of 'exceptional
points.' When these are present, information states don't decay in the
usual way: instead, any gains and losses of quantum information can be perfectly balanced between states.

By accounting for quantum effects, Reboiro and colleagues modelled how
the dynamics of ensembled imperfections were affected by their surrounding environments. From these results, they combined information states which displayed large transition probabilities over long time intervals --
allowing them to generate exceptional points. Since this considerably
increased the survival probability of a state, the team could finally
prepare initial states which were robust against the effects of their environments. Their techniques could soon be used to build quantum
information systems which retain their information for far longer than
was previously possible.


========================================================================== Story Source: Materials provided by Springer. Note: Content may be edited
for style and length.


========================================================================== Journal Reference:
1. Romina Rami'rez, Marta Reboiro, Diego Tielas. Exceptional Points
from the
Hamiltonian of a hybrid physical system: Squeezing and
anti-Squeezing.

The European Physical Journal D, 2020; 74 (9) DOI:
10.1140/epjd/e2020- 10218-1 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/09/200928125012.htm

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