The problem of measuring a time-varying phase, even when the statistics of the variation is known, is considerably harder than that of measuring a constant phase. In particular, the usual bounds on accuracy, such as the 1/(4¯n) standard quantum limit with coherent states, do not apply. Here, by restricting to coherent states, we are able to analytically obtain the achievable accuracy, the equivalent of the standard quantum limit, for a wide class of phase variation.
More Articles
The Atomic Revolution
The 2023 Boyer Lecture series is called 'The Atomic Revolution' and is presented by Professor Michelle Simmons AO, a pioneer in atomic electronics and global leader in quantum computing.
READCelebrating excellence: Success for CQC2T at the Prime Minister’s Prize, Science Awards 2023
CQC2T Director Professor Michelle Simmons AO and Chief Investigator Professor Yuerui (Larry) Lui were recognised in the prestigious 2023 Prime Minister’s award ceremony held at Parliament House last n
READWorld Record Broken in Quantum Teleportation
An international team of researchers has developed a technology that has shattered a world record in continuous variable quantum teleportation. This latest technology offers a viable pathway enroute t
READTransversal injection for direct encoding of ancilla states for non-Clifford gates using stabilizer codes
Fault-tolerant, error-corrected quantum computation is commonly acknowledged to be crucial to the realisation of large-scale quantum algorithms that could lead to extremely impactful scientific or com
READJellybeans – a sweet solution for overcrowded circuitry in quantum computer chips
Engineers show that a jellybean-shaped quantum dot creates more breathing space in a microchip packed with qubits.
READ