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In the tests for macrorealism proposed by Leggett and Garg, the temporalcorrelation functions of a dichotomic variable Q must be measured in anon-invasive way to rule out alternative classical explanations of Leggett-Garginequality violations. Ideal negative measurements, in which a null result isargued to be a non-invasive determination of the system's state, are oftenused. From a quantum-mechanical perspective, such a measurement collapses thewave function and will therefore typically be found to be invasive under anyexperimental check. Here, a simple modified ideal negative measurement protocolis described for measuring the correlation functions which is argued to benon-invasive from both classical and quantum perspectives and hence thenon-invasiveness can then be checked experimentally, thereby permitting aquantitative measure of the degree of clumsiness of the measurement. It is alsoshown how this procedure may be extended to measure higher-order correlationfunctions and a number of higher-order conditions for macrorealism are derived.

Leggett-Garg tests of macrorealism: checks for non-invasiveness and generalizations to higher-order correlators