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In quantum computing, quantum memory is the quantum-mechanical version of ordinary computer memory. Whereas ordinary memory stores information as binary states (represented by "1"s and "0"s), quantum memory stores a quantum state for later retrieval. These states hold useful computational information known as qubits.
An optical quantum computer with three qubits calculates the energy spectrum of molecular hydrogen to high precision. [156] The first germanium laser advances the state of optical computers. [157] A single-electron qubit is developed [158] The quantum state in a macroscopic object is reported. [159] A new quantum computer cooling method is ...
~ 10 42 bits – the number of bits required to perfectly recreate the natural matter of the average-sized U.S. adult male human brain down to the quantum level on a computer is about 2.6 × 10 42 bits of information (see Bekenstein bound for the basis for this calculation). 2 193: 10 58
The Margolus–Levitin theorem sets a bound on the maximum computational speed per unit of energy: 6 × 10 33 operations per second per joule.This bound, however, can be avoided if there is access to quantum memory.
The earliest known commercial product to use FeRAM is Sony's PlayStation 2 Memory Card (8 MB), released in 2000. [ citation needed ] The Memory Card's microcontroller (MCU) manufactured by Toshiba contained 32 kb (4 kB ) embedded FeRAM fabricated using a 500 nm complementary MOS (CMOS) process.
Computer memory stores information, such as data and programs, for immediate use in the computer. [2] The term memory is often synonymous with the terms RAM , main memory , or primary storage . Archaic synonyms for main memory include core (for magnetic core memory) and store .
Phase-change memory (also known as PCM, PCME, PRAM, PCRAM, OUM (ovonic unified memory) and C-RAM or CRAM (chalcogenide RAM)) is a type of non-volatile random-access memory. PRAMs exploit the unique behaviour of chalcogenide glass .
The memory cell is the fundamental building block of computer memory. The memory cell is an electronic circuit that stores one bit of binary information and it must be set to store a logic 1 (high voltage level) and reset to store a logic 0 (low voltage level). Its value is maintained/stored until it is changed by the set/reset process.