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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.
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.
Transistors made of a single sheet of silicon atoms one atom tall and other 2D materials have been researched for use in processors. [13] Quantum processors have been created; they use quantum superposition to represent bits (called qubits) instead of only an on or off state. [14] [15]
The state of this one-qubit quantum memory can be manipulated by applying quantum logic gates, analogous to how classical memory can be manipulated with classical logic gates. One important gate for both classical and quantum computation is the NOT gate, which can be represented by a matrix X := ( 0 1 1 0 ) . {\displaystyle X:={\begin{pmatrix}0 ...
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. [10]
Use of protected memory greatly enhances both the reliability and security of a computer system. Without protected memory, it is possible that a bug in one program will alter the memory used by another program. This will cause that other program to run off of corrupted memory with unpredictable results. If the operating system's memory is ...
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If the memory address consists of M bits, the number of addresses on the chip is 2 M, each containing an N bit word. Consequently, the amount of data stored in each chip is N2 M bits. [5] The memory storage capacity for M number of address lines is given by 2 M, which is usually in power of two: 2, 4, 8, 16, 32, 64, 128, 256 and 512 and ...