LONG-TIME LOW-LATENCY QUANTUM MEMORY BY DYNAMICAL DECOUPLING

摘要

This disclosure relates to preserving a quantum state in a quantum memory. A controller of the quantum memory determines based on a characteristic of noise that causes deterioration of the quantum state a dynamical decoupling base sequence. The duration of the base sequence is shorter than or equal to an access latency time of the quantum memory to allow access to the quantum state within the access latency time. Further, the deterioration of the quantum state is bounded to an upper deterioration limit when the base sequence is repeatedly applied to the quantum system. This provides acceptable access times while simultaneously allowing long term storage of data in the quantum state with low error rates. Repeatedly applying the base sequence to the quantum system will first yield an increasing deterioration but that deterioration will eventually reach the upper limit. As a result, over time the error rates will not exceed that upper limit and the quantum state is stable.

主权项

1. A method for preserving a quantum state of a quantum system in a quantum memory, the method comprising:
determining based on a characteristic of noise that causes deterioration of the quantum state a dynamical decoupling base sequence
such that the duration of the base sequence is shorter than or equal to an access latency time of the quantum memory to allow access to the quantum state within the access latency time, andsuch that the deterioration of the quantum state is bounded to an upper deterioration limit when the base sequence is repeatedly applied to the quantum system.