Passengers on any airline and visitors traveling into Qatar through any port of entry, who are nationals of the 80 eligible countries, are eligible for the visa waiver. (The visa offered exclusively to Qatar Airways passengers is the free, pre-arranged Qatar Transit Visa for passengers who have a stopover on Qatar Airways of between 5 and 96 hours.)
Nationals of the Turkish Republic of Northern Cyprus can be granted a visa on their arrival into the State of Qatar on the condition that they are arriving on a Qatar Airways flight with a minimum passport validity of 6 months and a confirmed onward or return ticket.
Please visit the below link for more information about visa-free arrival to Qatar
Read more about “Qatar Stopover” programme through this link