Work

How Long Can a Quantum Memory Withstand Depolarizing Noise?

Year: 2009

Type: article

Abstract: We investigate the possibilities and limitations of passive Hamiltonian protection of a quantum memory against depolarizing noise. Without protection, the lifetime of a single qubit is independent of N, the number of qubits composing the memory. In the presence of a protecting Hamiltonian, the lifetime increases at most logarithmically with N. We construct an explicit time-independent Hamiltonian which saturates this bound, exploiting the noise itself to achieve the protection.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.103.080501

Authors: Fernando Pastawski, Alastair Kay, Norbert Schuch, Ignacio Cirac

Institutions: Max Planck Institute of Quantum Optics, University of Cambridge

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W1987848677

FWCI: 2.164

Cites: 12

Cited by: 22

Related to: 10