Four-tone phase insensitive geometry for mølmer-sørensen interaction with confined quantum objects

A method for performing a Mølmer-Sørensen (MS) gate, the method comprising:

• controlling operation of a confinement apparatus confining two or more quantum objects to cause the two or more quantum objects to be located at a defined location of the confinement apparatus, wherein a qubit space of the one or more quantum objects is defined to comprise two qubit states;
• and
• controlling operation of one or more manipulation sources to cause generation of a first manipulation signal, a second manipulation signal, a third manipulation signal, and a fourth manipulation signal, wherein the first manipulation signal and the fourth manipulation signal are configured, when the first manipulation signal and the fourth manipulation signal interact, to provide a red sideband signal corresponding to a Raman transition between the two qubit states and the second manipulation signal and the third manipulation signal are configured, when the second manipulation signal and the third manipulation signal interact, to provide a blue sideband signal corresponding to the Raman transition between the two qubit states,
• wherein the first manipulation signal and the second manipulation signal are provided to the defined location via a first beam path and the third manipulation signal and the fourth manipulation signal are provided to the defined location via a second beam path to cause the first manipulation signal and the fourth manipulation signal to interact to provide the red sideband signal and to cause the second manipulation signal and the third manipulation signal to interact to provide the blue sideband signal, and
• wherein there is a non-zero angle between the first beam path and the second beam path at the defined location.