From Longman Dictionary of Contemporary Englishpassport to success/health/romance etcpassport to success/health/romance etcWAY/METHODsomething that makes it easy for you to achieve success, good health etc She saw a good diet as a passport to good health. Don’t assume that winning a talent contest is a passport to success. → passport
Examples from the Corpus
passport to success/health/romance etc• We live in an increasingly competitive world where good qualifications are a passport to success.• Finally, don't assume winning a talent contest is a passport to success.• The Union Jack will be our passport to romance.• Early on he learned - the hard way - that it was the passport to success. 