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Quantum random access memory.

Vittorio Giovannetti1, Seth Lloyd, Lorenzo Maccone

  • 1NEST-CNR-INFM & Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126, Pisa, Italy.

Physical Review Letters
|June 4, 2008
PubMed
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This study introduces a novel quantum random access memory (QRAM) architecture. It significantly reduces addressing requirements and power consumption for quantum computing applications.

Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Computer Engineering

Background:

  • Classical Random Access Memory (RAM) utilizes n bits to address 2^n memory cells.
  • Quantum Random Access Memory (QRAM) aims to address quantum superpositions of memory cells using n qubits.

Purpose of the Study:

  • To present a novel QRAM architecture.
  • To exponentially reduce the resources required for memory addressing in QRAM.
  • To enhance the robustness and efficiency of QRAM algorithms.

Main Methods:

  • Developed a new QRAM architecture.
  • Analyzed the number of switches required for memory calls.
  • Investigated entanglement requirements for QRAM algorithms.
  • Proposed a quantum optical implementation.

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Main Results:

  • The proposed architecture requires O(logN) switches, an exponential reduction compared to conventional N switches.
  • The QRAM algorithm is more robust due to reduced entanglement requirements.
  • Achieved an exponential decrease in power needed for addressing.
  • Presented a feasible quantum optical implementation.

Conclusions:

  • The novel QRAM architecture offers significant advantages in terms of efficiency and robustness.
  • This development is crucial for advancing quantum computing hardware.
  • The proposed design paves the way for more scalable and powerful quantum memory solutions.