A laser apparatus for excitation of Rubidium atoms in a quantum processor comprising: - an Er-doped DFB fiber laser for emitting light at a wavelength of around 1560 nm; - at least a first Yb-doped DFB fiber laser for emitting light at a wavelength of around 1090 nm; - a fiber-coupled laser source for emitting light at a wavelength of around 1013 nm; - a first fiber-coupled SHG device configured to receive said light from said Yb-doped DFB fiber laser and to produce light at a wavelength of around 545 nm; - at least a first fiber-coupled DFG device configured to receive a first part of said light from said Er-doped DFB fiber laser and said light from said first fiber-coupled SHG device and produce light at a wavelength of around 840 nm; - a second fiber-coupled SHG device configured to receive a first part of said light from said first fiber-coupled DFG device and produce light at a wavelength of around 420 nm; - a third fiber-coupled SHG device configured to receive a second part of said light from said Er-doped DFB fiber laser and produce light at a wavelength of around 780 nm, wherein said light at a wavelength of around 780 nm is configured to produce MOT laser beams for magneto-optical trapping of the Rubidium atoms and an optical pumping laser beam for optical pumping of the Rubidium atoms; wherein said light at a wavelength of around 840 nm is configured to produce a dipolar trapping beam for trapping individual Rubidium atoms at predetermined locations; wherein said light at a wavelength of around 420 nm and said light at a wavelength of around 1013 nm are configured to produce Rydberg laser beams (141, 142) for transition of Rubidium atoms to Rydberg states. - an Er-doped DFB fiber laser for emitting light at a wavelength of around 1560 nm; - at least a first Yb-doped DFB fiber laser for emitting light at a wavelength of around 1090 nm; - a fiber-coupled laser source for emitting light at a wavelength of around 1013 nm; - a first fiber-coupled SHG device configured to receive said light from said Yb-doped DFB fiber laser and to produce light at a wavelength of around 545 nm; - at least a first fiber-coupled DFG device configured to receive a first part of said light from said Er-doped DFB fiber laser and said light from said first fiber-coupled SHG device and produce light at a wavelength of around 840 nm; - a second fiber-coupled SHG device configured to receive a first part of said light from said first fiber-coupled DFG device and produce light at a wavelength of around 420 nm; - a third fiber-coupled SHG device configured to receive a second part of said light from said Er-doped DFB fiber laser and produce light at a wavelength of around 780 nm, wherein said light at a wavelength of around 780 nm is configured to produce MOT laser beams for magneto-optical trapping of the Rubidium atoms and an optical pumping laser beam for optical pumping of the Rubidium atoms; wherein said light at a wavelength of around 840 nm is configured to produce a dipolar trapping beam for trapping individual Rubidium atoms at predetermined locations; wherein said light at a wavelength of around 420 nm and said light at a wavelength of around 1013 nm are configured to produce Rydberg laser beams (141, 142) for transition of Rubidium atoms to Rydberg states.