Quantum random access memory

Details Quantum random access memory Quantum random access memory

2007-08-14

arxiv.org/abs/0708.1879v2

V. Giovannetti, S. Lloyd, L. Maccone, Phys. Rev. Lett. 100, 160501 (2008).

Physics

Quantum Physics

4 pages, 3 figures. Accepted for publication on Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.160501

A random access memory (RAM) uses n bits to randomly address N=2^n distinct memory cells. A quantum random access memory (qRAM) uses n qubits to address any quantum superposition of N memory cells. We present an architecture that exponentially reduces the requirements for a memory call: O(log N) switches need be thrown instead of the N used in conventional (classical or quantum) RAM designs. This yields a more robust qRAM algorithm, as it in general requires entanglement among exponentially less gates, and leads to an exponential decrease in the power needed for addressing. A quantum optical implementation is presented.

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