A clock signal distribution method and system. The clock signal distribution method includes transmitting an optical clock signal at a clock frequency via an optical waveguide, wherein the optical clock signal is transmitted separately from optical data transmissions. The method further includes receiving the optical clock signal at the same clock frequency using a photodetector and converting the optical clock signal into an electrical clock signal using the photodetector. The electrical clock signal has the same clock frequency as the optical clock signal. The method further includes transmitting the electrical clock signal at the clock frequency via an electrical connection.

A system for generating clock signals for a photonic quantum computing system includes a pump photon source configured to generate a plurality of pump photon pulses at a first repetition rate, a waveguide optically coupled to the pump photon source, and a photon-pair source optically coupled to the first waveguide. The system also includes a photodetector optically coupled to the photon-pair source and configured to generate a plurality of electrical pulses in response to detection of at least a portion of the plurality of pump photon pulses at the first repetition rate and a clock generator coupled to the photodetector and configured to convert the plurality of electrical pulses into a plurality of clock signals at the first repetition rate.

A storage system includes a protective housing member configured to mate with a handheld electronic device. The protective housing member includes a charging area formed between a surface of the protective housing member and a surface of an accessory item of the handheld electronic device. The charging area is configured to charge the accessory item of the handheld electronic device. The charging area is powered by at last one power component of the protective housing member or at least one power component of the handheld electronic device. The storage system further includes at least one integrated circuit which is either a component of the handheld electronic device or a component of the protective housing member.

The present disclosure relates to a device for generating a clock signal including a first photoresistor coupling a capacitive output node to a node receiving a first potential. A second photoresistor couples the capacitive node to a node receiving a second potential. The first and second photoresistors receive the same optical pulses of a mode-locked laser at instants in time offset by a first delay.

An accessory management system includes a first part which mates with a handheld electronic device. The first part includes a port to electrically connect an external device to the first part, a circuit board, a connector, and an accessory station configured to removably connect to an accessory item. The accessory station includes electrical contacts. The connector is configured to electronically or electrically connect to a port of the handheld electronic device and configured to transmit at least one of data and power between at least two of the following: the accessory management apparatus, the handheld electronic device, and the accessory item. The accessory item is independent from the first part and removably attaches to the first part. The electrical contacts are mounted proximate to the accessory item. The electrical contacts electrically connect the accessory item to either the first part or the handheld electronic device to transfer charging power.

A retractable storage system for a handheld electronic device has a protective housing member operative shaped and sized to bound the handheld electronic device and enable wrapping around the handheld electronic device. A charging station structured on the housing member has an aperture to arrest, dispense, charge and store an accessory item of the handheld electronic device. One or more storage chambers structured on the protective housing member to store the accessory item. An electric power transfer component provides an electrical power and is electrically connected to the charging station.

A memory controller component includes transmit circuitry and adjusting circuitry. The transmit circuitry transmits a clock signal and write data to a DRAM, the write data to be sampled by the DRAM using a timing signal. The adjusting circuitry adjusts transmit timing of the write data and of the timing signal such that an edge transition of the timing signal is aligned with an edge transition of the clock signal at the DRAM.

A system includes, in part, a first optical modulator adapted to modulate a first optical signal with a first data to generate a first modulated optical signal, a second optical modulator adapted to modulate a second optical signal with a first clock signal to generate a second modulated optical signal, an optical multiplexer adapted to multiplex the first and second optical signals to generate a multiplexed optical signal, and an optical fiber adapted to carry the multiplexed optical signal. The second optical signal has a second wavelength that is different from the first wavelength.

A system for generating clock signals for a photonic quantum computing system includes a first pump photon source, a first photon-pair source optically coupled to the first pump photon source, and a first photodetector optically coupled to the first photon-pair source. The system also includes a first clock generator electrically coupled to the first photodetector, a second pump photon source, a second photon-pair source optically coupled to the second pump photon source, and a second photodetector optically coupled to the second photon-pair source. The system further includes a second clock generator electrically coupled to the second photodetector and a clock mediator coupled to the first clock generator and the second clock generator.

A system and a method for multimachine phase synchronization based on optical fiber transmission are provided. The system includes a master and a plurality of slaves, where an optical fiber transmitting interface of the master is connected to an optical fiber receiving interface of one slave, the slave connected to the master is connected in series with the other slaves in turn, the master transmits phase information of a digital reference source thereof as a system synchronous phase signal to the slave connected to the master, the slave takes the received system synchronous phase signal as a phase of the local digital reference source, and transmits the system synchronous phase signal to a slave connected to an optical fiber transmitting interface of the slave through the optical fiber transmitting interface, and when the last slave is connected to the master, the master and the slaves form a closed-loop communication test.