A quantum device includes: three first optical waveguides to which a quantum bit is coupled; a second optical waveguide; a beam splitter; a first optical switch that is provided to each of the three first optical waveguides and conducts switching between optical connection and disconnection between the first optical waveguide and the second optical waveguide; and a second optical switch that conducts switching between optical connection and disconnection between the second optical waveguide and the beam splitter.

The present invention is based on a two-dimensional photonic crystal in which are inserted, in a controlled manner, defects that originate the waveguides and the resonant cavity that integrate the device. Its main function is to provide the control of the passage of an electromagnetic signal over a communications channel, blocking (state off) or allowing (state on) the passage of the signal. It also has the function of changing the propagation direction of an electromagnetic signal by an angle of 60 degrees, offering greater flexibility in the design of integrated optical systems. The operating principle of the device is associated with the excitation of dipole modes in the resonant cavity, which is based on a magneto-optical material. When the switch is under the influence of an external DC magnetic field H.sub.0, a rotating dipole mode excited in the cavity allows the passage of the input signal to the output (state on), whereas without the application of H.sub.0, a stationary dipole mode excited in the cavity, with the nodes aligned to the output waveguide, prevents the passage of the input signal to the output (state off).

The invention relates to a switch that can be checked, which comprises a housing, an optical conductor (10) arranged in the housing, a deflecting device (16) for the optical conductor, which deflecting device is arranged in the housing, and a triggering device, which initiates a switching process of the switch and actuates the deflecting device at least at times. The deflecting device is designed in such a way that, when the deflecting device is actuated, the optical conductor is deflected in a defined manner such that the bending radius of the optical conductor changes in a defined manner. According to the invention, the switch that can be checked also has a restoring mechanism (34) for the deflecting device, and the restoring mechanism has a restoring delay, which returns the deflecting device to the original position of the deflecting device with a defined delay after the triggering device has been restored.

The present invention is based on a two-dimensional photonic crystal in which are inserted, in a controlled manner, defects that originate the waveguides and the resonant cavity that integrate the device. Its main function is to provide the control of the passage of an electromagnetic signal over a communications channel, blocking (state off) or allowing (state on) the passage of the signal. It also has the function of changing the propagation direction of an electromagnetic signal by an angle of 60 degrees, offering greater flexibility in the design of integrated optical systems. The operating principle of the device is associated with the excitation of dipole modes in the resonant cavity, which is based on a magneto-optical material. When the switch is under the influence of an external DC magnetic field H.sub.0, a rotating dipole mode excited in the cavity allows the passage of the input signal to the output (state on), whereas without the application of H.sub.0, a stationary dipole mode excited in the cavity, with the nodes aligned to the output waveguide, prevents the passage of the input signal to the output (state off).

The present disclosure is directed to design and fabrication of the dual layer optical switching cells that controllably distribute and reroute optical signals between bus optical waveguides of an optical switch network. A dual layer optical switching cell includes one or more mechanical optical switches fabricated above a waveguide layer that includes the bus optical waveguides. An optical switch includes a suspended shunt optical waveguide supported by a metallic structure and configured to couple light from one bus optical waveguide to another bus optical waveguide when is electro-mechanically actuated. Method of fabricating such optical switched include steps that enable fabrication of optical switching cells having silicon nitride or monocrystalline silicon optical waveguides, and a metallic clamping support structure.