Golden
Quantum Memory

Quantum Memory

Quantum memory is a quantum equivalent of classical computer memory but for quantum computers. Quantum memory can be used in quantum computers, quantum communication circuits and other systems. Qubits can be stored and retrieved at a future time.

Quantum memory is an interaction between matter and light, and can be implemented on materials such as cold atoms, ions and crystals with photons usually being the information carrier. The photonic quantum information makes quantum memory equivalent to the memory found in a classical computer.



The proposed advantage of quantum computation hinges on the difference between classical computation by maintaining a non-classical superposition of quantum states. However, when the quantum state is measured, the superposition is lost, making the information classical. In 2007, the concept of an off-resonant atomic quantum memory centered on the idea of a Raman interaction was suggested, and in 2009 was demonstrated by using Caesium vapor kept at room- temperature. The demonstration was capable of storing pulses at 0.3 billionths of a second duration.



The idea of quantum memory becoming a part of long-distance quantum communications or linear optics quantum computation has been experimented with as the use of quantum memory would fit for these applications. 



As of 2018, Researchers at Laboratoire Kastler Brossel (LKB) produced 68% efficiency on memory retrieval rates using polarized qubits with 99% conditional fidelity. Qubits were encoded using weak coherent states on a single photon.

Timeline

People

Name
Role
LinkedIn







Further reading

Title
Author
Link
Type
Date

Highly-efficient quantum memory for polarization qubits in a spatially-multiplexed cold atomic ensemble

Kun Huang, Alexandra S. Sheremet, Pierre Vernaz-Gris, Mingtao Cao, Julien Laurat

Academic paper



How can you tell if a quantum memory is really quantum?

Lisa Zyga





Physicists use quantum memory to demonstrate quantum secure direct communication

Lisa Zyga





Record-breaking efficiency for secure quantum memory storage

Universite P. et M. Curie





Documentaries, videos and podcasts

Title
Date
Link





Companies

Company
CEO
Location
Products/Services

D-Wave

Gerodie Rose, and Haig Farris

Burnaby, Canada

Quantum computing company

Google

Larry Page, Sergey Brin





IBM

Charles Ranlett Flint





Laboratoire Kastler Brossel

Alfred Kastler, and Jean Brossel



Laboratory focused on interactions between light and matter

NASA

Dwight D. Eisenhower





Qunnect

Mael Flament

Long Island, New York, United States

Creates quantum devices meant to optimize current digital communications

References