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Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%. Barends2016, Salathe2015, McKay2016.

As superconducting qubits work in microwave regime and are thus operated at cryogenic temperature it is not straight forward to do a two qubit gate between distant qubits. A gate between qubits on different chips in the same cryostat has been demonstrated (eg. Kurpiers2017a), but in order to conduct a gate between different cryostats either a microwave-to-optical and optical-to-microwave converter is needed or alternatively a low loss cryogenic microwave link needs to be built.

For gate defined semiconductor doubleQuantum dots

There are different degrees of freedom in multi-quantum-dot systems which can be used as a qubti. Thus there are different exact mechanisms. Typically either direct exchange interaction or tunable perturbation of a non-computational state is used.

Single-quantum-dot spin qubits: Watson2018

Double-quantum-dot spin qubits: Nichol2017

Between a spin and a photon: Mi2018

Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%. Barends2016, Salathe2015, McKay2016.

As superconducting qubits work in microwave regime and are thus operated at cryogenic temperature it is not straight forward to do a two qubit gate between distant qubits. A gate between qubits on different chips in the same cryostat has been demonstrated (eg. Kurpiers2017a), but in order to conduct a gate between different cryostats either a microwave-to-optical and optical-to-microwave converter is needed or alternatively a low loss cryogenic microwave link needs to be built.

For gate defined semiconductor double-quantum-dot spin qubits: Nichol2017

Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%. Barends2016, Salathe2015, McKay2016.

As superconducting qubits work in microwave regime and are thus operated at cryogenic temperature it is not straight forward to do a two qubit gate between distant qubits. A gate between qubits on different chips in the same cryostat has been demonstrated (eg. Kurpiers2017a), but in order to conduct a gate between different cryostats either a microwave-to-optical and optical-to-microwave converter is needed or alternatively a low loss cryogenic microwave link needs to be built.

Quantum dots

There are different degrees of freedom in multi-quantum-dot systems which can be used as a qubti. Thus there are different exact mechanisms. Typically either direct exchange interaction or tunable perturbation of a non-computational state is used.

Single-quantum-dot spin qubits: Watson2018

Double-quantum-dot spin qubits: Nichol2017

Between a spin and a photon: Mi2018

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source | link

Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned turned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%. Barends2016, Salathe2015, McKay2016.

As superconducting qubits work in microwave regime and are thus operated at cryogenic temperature it is not straight forward to do a two qubit gate between distant qubits. A gate between qubits on different chips in the same cryostat has been demonstrated (eg. Kurpiers2017a), but in order to conduct a gate between different cryostats either a microwave-to-optical and optical-to-microwave converter is needed or alternatively a low loss cryogenic microwave link needs to be built.

For gate defined semiconductor double-quantum-dot spin qubits: Nichol2017

Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned turned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%. Barends2016, Salathe2015, McKay2016.

For gate defined semiconductor double-quantum-dot spin qubits: Nichol2017

Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%. Barends2016, Salathe2015, McKay2016.

As superconducting qubits work in microwave regime and are thus operated at cryogenic temperature it is not straight forward to do a two qubit gate between distant qubits. A gate between qubits on different chips in the same cryostat has been demonstrated (eg. Kurpiers2017a), but in order to conduct a gate between different cryostats either a microwave-to-optical and optical-to-microwave converter is needed or alternatively a low loss cryogenic microwave link needs to be built.

For gate defined semiconductor double-quantum-dot spin qubits: Nichol2017

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Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned turned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%.

Gate defined semiconductor double-quantum-dot spin qubits Barends2016, Salathe2015, McKay2016.

SeeFor gate defined semiconductor double-quantum-dot spin qubits: Nichol2017

Superconducting qubits

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%.

Gate defined semiconductor double-quantum-dot spin qubits

See Nichol2017

Superconducting qubits

There are several possible approaches. In the most popular scheme the qubits are always coupled, but off resonant and thus the energy conservation prevents the exchange of excitation. With external magnetic flux the qubits can be tuned turned temporarily into a resonance. The qubits will pick up a phase, which will depend on the state of the other qubit.

For first works see Strauch2003 or DiCarlo2009.

These days cPhase gates are done routinely < 300 ns and fidelity >99%. Barends2016, Salathe2015, McKay2016.

For gate defined semiconductor double-quantum-dot spin qubits: Nichol2017

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