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The field of quantum computing and information with superconducting circuits has made giant leaps and bounds. Here are a few articles that mark the milestones in this field.
- This lecture delivered by Richard Feynman was where the quest for a quantum computer germinated!
- Here is a very useful review article on superconducting circuits by Frank Wilhelm and John Clarke.
- The turn of the 21st century was indeed a turning point for superconducting circuits. Yasunobu Nakamura et al., showed that the quantum states of a single cooper pair box can be coherently classically controlled.
- After a few years of low coherence superconducting qubits, and dissipative readout schemes, in 2004 Andreas Wallraff et al., at Schoelkopf lab in Yale made a huge breakthrough by coupling a single cooper-pair box to a microwave resonator and launched the field of circuit quantum electrodynamics.
- Here is a theory article by Alexandre Blais et al., that explains the basics of circuit quantum electrodynamics
- The last of the Single Cooper-pair boxes before they vanished from the scene to make way for transmons -- this paper by B. Suri et al., showed the longest T1 time (200 us) in a superconducting device, though dephasing due to charge noise limited its use as a qubit. The article also does a thorough examination of the purcell effect due to the resonator.
- This theory article by Jens Koch et al., gave the first theoretical description of what turned out to be the most intuitive and most popular superconducting qubit - the transmon.
- While transmons coupled to superconducting coplanar resonators were struggling to break the 10us T1 and T2 barrier, Hanhee Paik et al., at Yale placed the chip inside a 3D aluminium microwave cavity to reduce dielectric losses and achieved long coherence times that were nearly T1 limited.
- For a while, 3D transmons took over the field, but questions of scalability lingered in people's minds. Then came this article by Barends et al., in John Martinis's group reporting their version of the grounded transmon- now called the x-mon due to its shape - which utilised sophisticated fabrication improvements to achieve long coherence times and gave a very scalable alternative.
Milestones in quantum physics
Milestones in quantum physics
Below is a list of a few related articles and other reading material which we find interesting -- a very subjective list after all -- and hope you find them useful. Please click on the description/comment to take you to the relevant webpage.
- This deeply insightful article by Einstein Podolsky and Rosen was where the enigma of Entanglement was first discovered, more in a vein of skepticism about the quantum theory.
- Niels Bohr fervently defended the quantum theory in this response to the above EPR question, although the EPR question lingered on at a deeper level.
- It took thirty years before John S Bell provided an experimentally measurable criterion, via a famous inequality (Bell's inequality), to verify whether local realism ala EPR was violated.
- Once in a while a discovery comes along -- so simple yet so fundamental that one feels it ought to have been discovered earlier. One such was the proof of the statement that "A single quantum cannot be cloned" - the famous No-Cloning theorem of Quantum Mechanics, discovered by Wooters and Zurek a good half century after the formulation of the theory. By cloning we mean creating a copy while retaining the original. In other words, they proved that there exists no system satisfying the fundamental quantum principle of linear superposition that copies/clones/amplifies at the output any arbitrary quantum state input into it. Note that a system like that can be created to clone a given quantum state, but it will not work for any arbitrary unknown state.
- This lecture delivered by Richard Feynman was where the quest for a quantum computer germinated!
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