Xanadu slashes quantum memory gate costs with dense encoding

Researchers at Xanadu have cut the core gate cost for loading classical data into quantum computers by about four times, publishing two approaches that together reduce the hardware overhead for quantum table lookups by 75%. They achieved this by doubling up data written on each qubit and optimizing how memory is accessed. This means future quantum simulations in chemistry and finance could run with far less hardware.

• Savings are specific to fault-tolerant quantum memory loading
• Uses dense encoding to write two bits per qubit at once
• Reduces core 'Toffoli' gate costs by 3.9 times
• Key for chemistry, physics, and financial quantum algorithms