The summit will discuss the evolving threats and highlight steps to minimize the use of highly-enriched uranium.
Pakistan is one of the 53 states, besides four international observers – the United Nations, the International Atomic Energy Agency, Interpol and the European Union -invited to be part of the NSS process.
The summit also offered an opportunity for Pakistan to project its credentials in the nuclear field.
On the sidelines of the summit, the prime minister is expected to have meeting with President Obama. Besides other issues, security situation in the region is likely to come up for discussion.
The prime minister will also meet other world leaders on the occasion.