Using ‘qubits’ instead of the traditional method involving ‘bits’. Quantum memory could be the key to dramatically increasing the amount of information that can be stored on a computer - and making computers much faster at solving certain types of problems. The field of quantum memory, or simply how to store information on a quantum computer, covers everything from the best-suited physical systems to abstract methods that can be used to increase the computer’s performance. Quite simply, quantum memory is the quantum-mechanical version of ordinary computer memory because it takes advantage of the strange ability of subatomic particles to exist in more than one state at any given time. Due to the way these tiny particles behave, certain computer operations can be done much more quickly and use less energy than classical computers - where information is traditionally stored as a series of 0s and 1s known as “bits.” By way of contrast, quantum memory involves storing data within basic units of quantum information known as “qubits,” or “quantum bits.” The relative advantage of qubits is that they can have more than two states to process or store information, due to something known as the “quantum superposition” phenomenon. A quantum computer has a third state, where the qubit can be a mixture of 0 and 1 - relative to the contribution of each of these two states. As a result, greater storage capacity as well as the utilization of sophisticated algorithms to process information may dramatically increase the efficiency of solving particular kinds of computational problems - and could revolutionize modern computing in the process. Several ways to build a quantum computer based on qubits have already been proposed, and researchers are evaluating these proposals experimentally to find out which may be the most promising methods around which to build a fully-functional computer. The use of photons seems, as of now, to be the most promising solution. One recent advancement has been the successful secure storage and retrieval of qubits; while the efficiency rate of optical qubit storage was previously 30%, researchers at Laboratoire Kastler Brossel (LKB) in Paris managed to increase this to 70%. Because quantum memory will be essential to construct a quantum communication network, this development has been viewed as a significant step forward.

## Quantum Computer Memory

KEY TRENDS

Quantum Computing