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Quantum computing on encrypted data.

K A G Fisher1, A Broadbent2, L K Shalm3

  • 11] Institute for Quantum Computing, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1 [2] Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1 [3].

Nature Communications
|January 22, 2014
PubMed
Summary
This summary is machine-generated.

We developed a method for secure quantum computations on encrypted data. This allows untrusted servers to perform quantum operations on private quantum bits (qubits) without compromising data privacy.

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Area of Science:

  • Quantum Information Science
  • Cryptography
  • Secure Computation

Background:

  • Performing computations on encrypted data enhances privacy in classical computing.
  • Existing classical protocols enable secure computations on encrypted data.
  • The quantum analogue of secure computation on encrypted data remained an open challenge.

Purpose of the Study:

  • To present an efficient solution for performing arbitrary quantum computations on encrypted quantum data.
  • To enable untrusted servers to execute quantum gates on encrypted quantum bits (qubits) without data leakage.
  • To allow clients to decrypt computation results using a private key.

Main Methods:

  • Theoretical framework for quantum computation on encrypted data.
  • Development of a universal set of quantum gates for encrypted qubits.
  • Experimental demonstration using single photons and linear optics for encryption and decryption.

Main Results:

  • An efficient protocol for arbitrary quantum computations on encrypted quantum data.
  • Proof of security: untrusted servers cannot learn input information.
  • Successful experimental demonstration of the encryption/decryption scheme for essential quantum gates.

Conclusions:

  • The proposed protocol enables secure, arbitrary quantum computations on encrypted quantum data.
  • The scheme is resource-efficient and can be integrated into future quantum servers.
  • This work is crucial for developing secure distributed quantum systems.