PsiQuantum

In this talk we will describe progress towards large-scale, fault-tolerant quantum computing with photons. This talk will span materials innovations for high-performance photonics, improvements in photonic component performance with an emphasis on improved optical loss, prototype systems of entangled photonic qubits, qubit networking, and novel high-power cryogenic cooling solutions designed for future datacenter-scale quantum computers. We will show new prototype systems designed to progressively overcome the key challenges to scaling up photonic quantum computers. We will also give an overview of the architecture of fusion-based photonic quantum computers, describe near-term systems milestones, and give a view on the long-term roadmap to useful, fault-tolerant machines.

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Ultrashort pulsed (mode-locked) lasers are widely used for many applications, such as imaging, biosensing, spectroscopy, LiDARs, and communication. Pulsed lasers are also important in quantum sciences, where they are used for precise control and measurement of quantum systems. Because of the wide variety of applications, femtosecond pulse technology has already led to four Nobel Prizes (1999, 2005, 2018, 2023). However, state-of-the-art femtosecond lasers are bulky and cost hundreds of thousands of dollars, remarkably limiting their use. Our goal is to fabricate such ultrashort lasers on an integrated photonic platform, bringing the cost and size down by several orders of magnitude and democratizing the femtosecond technology for even wider use.

In this talk, I present our lab group’s work on miniaturizing Ti:sapphire laser technology, a gold standard platform for tunable and ultrashort (5-10 fs) lasers due to their unmatched bandwidth (650-1100 nm). So far, we have demonstrated on-chip tunable Ti:sapphire lasers less than 0.5 mm in size, enabling optical control of silicon carbide defects in a cavity QED experiment. Now, we focus on mode-locking on-chip Ti:sapphire lasers, working towards the first on-chip femtosecond laser using a solid-state crystal gain material.

Point defects in diamond have emerged as powerful tools for quantum technologies owing to their excellent optical and spin properties. These defects serve as deterministic single-photon sources and solid-state quantum memories for quantum information processing as well as nanoscale quantum sensors to detect various physical quantities (e.g., magnetic fields, electric fields, and temperature). Recent development of nanofabrication technologies for high-quality single-crystal diamond has boost the diamond-based quantum technologies. Incorporating these diamond nanostructures with mature integrated photonics would further accelerate building scalable and practical quantum systems. This talk will focus on recent progress and challenges in hybrid diamond integrated photonics.

Quantum sensors based on thermal alkali vapors are a promising new category of sensors that optically interrogate atoms in a vapor cell and make use of their sensitivity to changes in their environment, such as changes in the magnetic or gravitational fields surrounding the atoms. 

At Hamamatsu we have a long history of manufacturing photonic technology based on precision glasswork and alkali material processing. This puts us in a unique position to add value to the quantum sensor market. 

In this talk, I would like to introduce Hamamatsu’s recent development efforts in the field of quantum sensors with a focus on our optically pumped magnetometer which is scheduled to be released in late-2025.   

QCi

Photonic-based devices are quickly emerging as a forerunner for the practical implementation of quantum technologies, such as, quantum computers, quantum information processors, quantum communication devices and quantum sensors. In this talk, we will argue that Thin Film Lithium Niobate on Insulator is an ideal materials system that meets both the aforementioned scientific and technological requirements. We will share our recent results fabricating and characterizing TFLN devices as well as our progress in building a foundry for TFLN processing.

As the demand for high-baudrate communication continues to rise, opto-electronic co-design is becoming ever more essential. Applications such as high-speed optical interconnects and radio-over-fiber require precise coordination of key performance parameters, such as noise, bandwidth, and linearity, across both photonic integrated circuits (PICs) and electronic integrated circuits (EICs). However, the absence of a mature PIC design flow remains a significant bottleneck, especially as system complexity scales. This work introduces a PIC design flow, mirroring many aspects of EIC design practices, implemented within the Cadence environment.  Specifically, it presents the electro-optic design of a traveling-wave Mach-Zehnder modulator (TW-MZM), alongside the design of a photonics-assisted phased array.

Rochester Institute of Technology

TBD