QUANTUM STORAGE & MEMORY

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Quantum computers stand to transform the world of computers. They have the capacity to be greatly more powerful than our current digital devices, with the power to solve important computational problems and simulate complex physical systems with unmatched efficiency.

Like memories are an important component for computers, that’s like quantum memories are also essential components for quantum computers, a new generation of data processors that follow the laws of quantum mechanics and these laws help to overcome the limitations of classical computers. Quantum computers are expected to be much faster and more powerful than their traditional analogue as information is calculated in qubits (the fundamental unit of computation in quantum computing)  in quantum computers while the older units are bits which used in classical computers, can represent both 0 and 1 at the same time.

Quantum memory is used as a key element in information processing, such as optical quantum computing and quantum communication.

Quantum memories are devices that can store the quantum state of a photon, without ruin the volatile quantum information carried by the photon. It is one such field where mapping of the quantum state of light onto a group of atoms and then restoring it to its original state. The quantum memory should be able to release a photon with the same quantum state where the photon is stored, after a duration set by the user.

C:\Users\HP\Desktop\FIG_QM.png

 

Quantum memories require a methodical matter system; otherwise, the quantum information stored inside the medium will be lost due to nonlinearities. Rare-earth-ion (RE) doped crystals are highly fascinating matter systems for quantum memories, as they own their unique optical and spin coherence properties at low temperatures (around 4 K).

Quantum memory schemes can be broken down into four distinct categories: single-photon memory, general state memory, memories that emit photons that can be measured directly, and memories that emit photons that are measured through retrieval. The type of memory to use depends on the needs of the experiment, namely the qualities of the photons that are to be stored.

Quantum memories will be proof as important components in future quantum networks, such as quantum repeaters which can provide a solution for long-distance quantum communication beyond the limit of 500 km using today's technology.

C:\Users\HP\Desktop\AFC_scheme.png

The AFC technique can store quantum information in a highly time-multiplexed fashion, which is helping to build the quantum repeaters for future quantum networks.

In addition to future applications, quantum memories are fascinating because they provide a way to study how quantum effects such as attachment can be transferred between physical systems of widely different nature, e.g. between light and matter systems.

References:

https://en.wikipedia.org/wiki/Quantum_memory

https://www.forbes.com/sites/tomcoughlin/2021/09/28/quantum-computing-memory-and-storage/?sh=2c025ea654f6

https://www.quantumlah.org/about/highlight/2019-03-quantum-memory-write-itself

 

YATIKA NAGAR

CSE-A

II Year

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