user: Question: When was Quantum Research's poll conducted?
Columns: ['Date of opinion poll', 'Conductor', 'Sample size', 'For', 'Against', 'Undecided']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['27 September 2009', 'Sunday Independent/Quantum Research', 1000.0, '68%', '17%', '15%']
SQL:

assistant: SELECT "Date of opinion poll" FROM "Table" WHERE "Conductor" = 'Quantum Research';